Wireless connection keeps dropping - WPA TKIP

[Adam Niedling]

Binary package hint: network-manager

I have a fresh install of Karmic. I'm trying to use my wireless network but it keeps disconnecting and reconnecting every half minutes. I have a WPA(TKIP) network. I'm attaching the syslog I think it shows what's going on.

I have a Acer Timeline 4810TG laptop with Intel WiFi Link 5100.

ProblemType: Bug
Architecture: i386
CRDA: Error: [Errno 2] Nincs ilyen fájl vagy könyvtár
Date: Thu Nov 12 18:10:01 2009
DistroRelease: Ubuntu 9.10
Gconf:

IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
IpRoute:
 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.103 metric 1
 169.254.0.0/16 dev eth0 scope link metric 1000
 default via 192.168.2.1 dev eth0 proto static
Package: network-manager 0.8~a~git.20091013t193206.679d548-0ubuntu1
ProcEnviron:
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: network-manager
Uname: Linux 2.6.31-14-generic i686
WifiSyslog:

[Adam Niedling (krychek)]

Changing the router's security settings to WPA2(AES) has solved this issue. But I still think this is a bug. Windows 7 on the same laptop and Jaunty on another one had stable wireless connection to the router with previous settings.

[blackjam (blackjam)]

I am having the same issues on Thinkpad T60 with Intel 3945. Fully upgraded Karmic fails to connect to any TKIP secured APs. WPA2-AES APs work OK. There must be somethink rotten in the TKIP handling.

[usererror (forums-etarq)]

I am also using the Intel 3945 Wireless Card. Connection "drops" every minute when using WPA - Personal TKIP. If I leave a constant ping on, it will stop pinging my router when the connection "drops" Sometimes the Network Manager will flash the tool tip saying disconnected, then reconnect. But other days it does not and the pinging just stops.

Other laptop I am using has a Broadcom card that does not drop, also running Ubuntu 9.10.

[usererror (forums-etarq)]

Changing my security to WPA2-AES did not help. Trying WPA2 TKIP+AES

[usererror (forums-etarq)]

Using both WPA2 TKIP+AES i am having wireless drops now with both my laptops, but they appear not as frequent.

[technoboi (m-launchpad-leafcom-co-uk)]

This might be the same problem that I am getting. I am using Karmic Netbook Remix on an Eee PC901.
It does connect to the wifi but it slowly degrades and thus downloads get painfully slow. Starts on full bars, then it might jump to 2 bars, then back to full...but eventually it drops to nothing and then disconnects. I then can't reconnect unless I reboot. I can however run the 'radar scan' application, which displays local networks that can be received, and it picks up my network and other networks in my area. I can, in the same position in my house, always get a good signal on my Nokia N95 (wifi).
So, I think that this is a software problem especially as, previously, I used a modified set up of Ubuntu 8.04 on this computer and the wireless worked just fine.

[Keith Patton (kaipee)]

Also having same issue with Kubuntu 9.10 (64bit). Wireless works perfectly fine but will not connect when router set to WPA (TKIP). I need to have it set to this for security reasons and to allow other older machines to connect.

[starlord (belrosee)]

I have been experiencing this recently on an upgrade from 9.04 to 9.10. Either way it is exactly as described in number 7. Let me know if you need more info. I'm not going to add more since it is unlikely to assist in resolution unless someone has a specific idea. I am running a fairly standard install, with a self-configured LAMP server. It works fine then drops and can't reconnect. Weird. I will try to make more observations.

[Pau Iranzo (paugnu)]

Same problem here. The strange thing is that this happens to me with my own router, but when I connect to other routers the problem disappears.

[Jeremy Audet (ichimonji10)]

 am also experiencing this problem, as described in post seven. I recently upgraded to 9.10 x64 from 9.04 x64. I had no problems with wireless in 9.04. My laptop is an Acer Aspire 3810TZ. The wireless chipset in it is an Atheros AR928X. Considering that I'm using wireless n in my household, my signals should not be dropping.

I've attached some information about my computer; hopefully this will help. Next time my connection drops, I'll see if I can find some information from the logs and post it here.

[humbhenri (humbhenri)]

Same problem here, using a ralink chip with the rt73usb module loaded. wicd keeps reconnecting automatically at every 2~5 seconds so I can surf the web, but any direct download is impossible.

[Jim Smith (jimsmithpirate)]

I also have this problem. I have a brand new (made Sept. 2009) Acer Aspire One and I am running the 9.10 Notebook Remix.

My wireless interface is: AR928X Wireless network Adapter (PCI-Express)
Vendor: Atheros Communications Inc.

My wireless connection comes up when I boot the system, but then it drops out after 5 minutes or so. This is really a pain!

[humbhenri (humbhenri)]

Another observation: with an unprotected network my connection doesn't drop and behave much better, the problem only occurs when using wpa it seems.

[Adam Niedling (krychek)]

Humbhenri: this is what this bug is about, read the description. If you get disconnected while using something other than WPA (TKIP) then it's another bug.

[IanO (iossher)]

I have the same problem on a Dell Vostro 1510 with an Intel 4965AGN wireless interface. Using 9.10 x64 and WPA (TKIP).

[humbhenri (humbhenri)]

After many tests with different networks and using ndiswrapper I see that my problem is not about ralink drivers cause the problem occurs using ndiswrapper too. With another router/network (from my neighbor) this problem don't happens. My guess is the router, will change it and see if the problem is gone.

[Romel (romel429)]

Guys I am having the same Problem. My wirelss connection encrypted by WPA2 and since i had a fresh install of Ubuntu-9.10 my wireless connection is dropping almost every 10 minutes and to get rid of that i have to restart the computer.
its so pain in the ass. i am frustrated so much...i thought version 9.10 will be flawless....seems LINUX will have trouble unless the worlds end....

hope Ubuntu fix this issue fast....

please let me know if any one had fixed their issues....

[David Tomaschik (matir)]

Romel: are you using WPA2+AES? Most of those who have reported the issue have systems using WPA-TKIP. Also, what wireless chipset do you have?

[Smot (smot-msn)]

I've just reported bug #505224 as a duplicate of this. It contains some syslog info which may help understanding the cause of this problem.

To cap it all, my laptop dropped off the network trying to file this comment.....

Trevor

[pr100 (paul-rudin)]

I had this problem with my dell vostro 1510 laptop. It was fine before upgrading to karmic, and then frequent disconnects after the upgrade.

I installed wicd instead of network manager that it works fine, so it does indeed seem that th eproblem is with network manager.

[pr100 (paul-rudin)]

I take it back... it worked fine with wicd initially. But now I'm seeing exactly the same problem. The strange thing is that either it's rock solid or very flaky; and you get either one thing or the other whenever you reboot.

[glycotrainer (kevin-kevinharper)]

Having same issue.

As reported by other users, I did not have this problem w/ Jaunty. Disconnects when connected via WPA2. Disconnects during downloads.

Oblivious to hardware make/models, but laptop is a Sony VGN-NW240F.

Sometimes Network Manager reconnects automatically, but most of the time I'm prompted for WPA key. When at home I type it in, when I'm not at home I have to restart. Sometimes key is accepted, but most times I have to restart. As already expressed by others, this is an extreme pain in the rear.

Just now (reason I looked for a solution) it has disconnected like 10 times while I try to DL a Linux Mint .iso.

[reibian (satoshishinozaki)]

Joining the party with Sony VGN-FE53B
Despite all the "tips" I got from the Ubuntu community to run various commands, like
dhclient -r
ifdown
ifup
/etc/init.d/networking/ restart (all under *sudo*),
restarting the whole system is the surest way to get the wireless back after "involuntary disconnects" from the router so far. Help!

[Kelly Harding (kelly-harding)]

Seems to have same problems with Lucid Alpha2 on my Aspire One.

[Henry Goldstein (henryg)]

Same problem here. I've been running Ubuntu 9.10 on a new Asrock ION 330HT for a week or so now. Wireless degrades over time after boot, and becomes pretty much useless. Wireless is mixed WPA/WPA2+WEP, and I'm using a passphrase for WEP and ascii psk for WPA (both Draytek Vigor 2800vn and a Linksys router used as an access point). I'm considering experimenting with changing to hex WEP and WPA keys, but am hoping that I won't have to, and that someone will come up with a definitive solution.

As I use wireless on the Asrock only to streaming media, I could probably do without encryption, but it would be nice to get the whole system working (as it is for this Windows notebook I'm typing on now ).

I've tried wicd, but gave up after quite a lot of trying to sort out a template that would work with my existing wireless router set-up.

I'll keep coming back to Launchpad to see how the community is getting on.

[Chronon (gopindra)]

I have AR928X chipset (Eee PC 1000HEB) and have had this problem with 9.10 and now with 10.04 (not with previous versions). I am using WPA (TKIP).

[Jeremy Audet (ichimonji10)]

Aside from restarting my computer, the surest way to reset my wireless connection is to issue:
sudo /etc/init.d/network-manager restart

I've tried turning off power management and increasing broadcast signal strength. Hey, maybe the problem lies not in Ubuntu, but in the wireless signal strength? Turning off power management did little. I tried issuing this:
sudo iwconfig wlan0 power off
While that command sucessfully turned off power management, doing so did not help me with my wireless connection. I also tried changing signal strength:
sudo iwconfig wlan0 txpower 120mW
OR
sudo iwconfig wlan0 txpower 25
However, neither of these commands completed sucessfully. I can, however, lower the broadcast strength of my wireless signal. For example, I can set the txpower to less than 100mW, and less than 20dBm. It appears that there is a limit on how much power I can sent to my wireless card. My default signal strength is 20dBm anyway, so these settings don't help me.

I suspect that the problem with my connection, may be as simple as a low broadcast power. Here's why:
1) From where I'm sitting, my laptop detects a connection strength of approx. -77dBm. It varies between -73 and -83. (oops -- my connection just dropped. Moving closer to WAP)
2) From where I'm sitting, my iPod touch detects a connection strength of approx -57dBm. It also varies between -53 and -61.
3) Both my wireless router, my iPod touch, and my laptop all include wireless N capable chipsets. All devices are operating at the 2.462GHz frequency.
4) All other (two) laptops used in this house have no problems connecting to WAP. They use wireless G.
5) Even when my laptop is THREE feet away from WAP, signal strength is still -55dBm (-53 to -59). That is TERRIBLE. iPod touch reports signal strength between -32 and -42 dBm.
6)From experimentation at school, I have found that my iPod touch does not establish a wireless connection if signal strength is below -75dBm. As a good rule of thumb, I try to make sure that the signal strength is above -72dBm.
7) When running Vista on this laptop, connection strength is MUCH better. I'll have to boot into Vista to check out how it treats wireless.

[Jeremy Audet (ichimonji10)]

I've done a little testing, using both Vista SP2 and Ubuntu 9.10 on my laptop. I went around to various locations in my house and tested the signal level my laptop was sensing. I used iwconfig to test the sensed signal level under Ubuntu and Vistumbler to test the sensed signal level under Vista. I do not yet know how to test transmit power (in either mW or dBm) under Vista, so that set of tests will have to wait.

Location 1
Ubuntu: -67 to -75dB
Vista: -44dB

Location 2
Ubuntu: -79 to -87dB
Vista: -59dB

Location 3
Ubuntu: -68dB
Vista: -44dB

For what it's worth, I'm still using WPA2 security. I checked the transmit signal strength on my WAP, and it's set to high (though it gave no actual numbers -- just the option of low, medium, and high). So far, it looks like I'm still having the same bug as the rest of you guys. I'll post more more stuff as I figure this mystery out.

BTW, do you all have the same symptoms as me? Or am I waaay off here? i.e. do you all have similar oddities with received signal strength under ubuntu vs other OSs?

[Smot (smot-msn)]

Thanks for some really useful info, ichimonji10. I haven't been able to get such empirical measurements as you, but your results do agree with the symptoms I get here.

When booted into Vista, wifi availability throughout my house is good - I never experience any dropouts. With Ubuntu 9.10, the connection drops frequently. It's not a "regular as clockwork" thing as sometimes it will stay connected for an hour or so, then other times I can't stay online for more than a few minutes. Sometimes it reconnects quickly, but mostly I struggle to get it to reconnect and have to give up and return to Vista.

Is the bit of software Vistumbler freely available? I could run it at home to give some comparative results to your.

[Jeremy Audet (ichimonji10)]

Vistumbler is free, and available for download at http://sourceforge.net/projects/vistumbler/

I was also looking for a program that would tell me my wireless transmit power under Vista. I found a program called WirelessMon that almost does the trick... but the TxPower field says "N/A". WirelessMon has a free 30 day trial.

Thanks for the feedback, Smot.

[Smot (smot-msn)]

I've installed Vistumbler, and under Vista, sitting in my usual armchair, I get a consistent -47db. Using wavemon in Ubuntu, in the same place, it sits mostly at -60db and, roughly every 2 seconds drops dramatically to -80db for a brief moment.

I'm wondering if this occasional drop is sufficiently low for the connection to be lost.

Do you see the same effect in your environment?

Also, interestingly, I can see around 8 wifi networks available in my area within Vista, but generally only three or four in the Network Manager list in Ubuntu. Very often, mine is the only one listed while another family member (using Windows 7) can see many more.

I may be wrong, but I'm not aware of a way in which the receptive "strength" of a wifi interface can be altered by software. The implication is that Ubuntu is somehow under-estimating the strength of signals, and making incorrect decisions on connectivity based on this evaluation.

Let's hope The Powers That Be have taken note of your signal strength findings!

[Jeremy Audet (ichimonji10)]

Nice program there -- I've never used wavemon before. In all my previous tests, I was just repeatedly issuing iwconfig and averaging the results.

I don't see the same results as you, where your signal repeatedly drops really low. I do get the occasional drop in signal quality, but it's neither as pronounced nor as consistent as what you see. Still, the basic effect is the same. Ubuntu doesn't properly sense wireless signals, and thus connection quality fails. I wouldn't be surprised if your occasional drop in signal quality is enough to kill your connection, especially if it lasts for more than a second.

I've mentioned that I want to figure out what the broadcast power is under Vista. I couldn't find any way to directly measure how much power is being sent to my wireless card under Vista, but I designed a test that effectively tells me the same thing. I logged into my WAP/Router, and found a tool which reports the signal quality of devices communicating with the WAP. The tool does not report signal quality in dB or nW, but rather as a percentage (of the theoretical best connection quality).

So, I went to various locations around my house, started pinging google with my laptop, and looked at the signal quality as reported by the WAP. Note that the location numbers below correspond with the location numbers I gave in post #29.

Location 1
Ubuntu: 100%
Vista: 100%

Location 2
Ubuntu: 90+%
Vista: 99-100%

Location 3
Ubuntu: 100%
Vista: 100%

#------------------------------------------------------------------#

So what does it all mean? Here's my best shot at interpreting these numbers thus far.

If a computer and WAP are having trouble communicating, then there are four possible problems.
1) WAP is not properly sending a signal.
2) WAP is not properly receiving a signal.
3) Computer is not properly sending a signal.
4) Computer is not properly receiving signal.

I know, this is really broad so far, but stick with me for a few paragraphs.

Case 1 and 2 are immediately ruled out. There are several different wireless devices in my house which use the WAP. My iPod touch, two other family members' laptops, and my own laptop (running Vista) all communicate with the WAP just fine. If the WAP was not properly sending or receiving signals, all the other people in this household would be having problems, too. Furthermore, my computer only has problems when running Ubuntu, further indicating that the problem lies with a particular computer, not the WAP.

Case 3 is also ruled out. Why? Well, the tests I just performed indicate that the WAP receives signals just fine, whether Vista or Ubuntu is broadcasting those signals. I verified this empirically in this post. The absolute lowest quality signal that the WAP sensed was 90%. A signal quality that high should be just fine for communication.

Furthermore, I did some research on the intertubes, and several technical folks seem to think that 100mW of power being sent to a wireless card is more than enough. As I understood it, 80mW of power is the point of diminishing returns -- send more power than that to a wireless card, and you're not getting much benefit. They were even discussing using 30 to 40mW of...

[Jeremy Audet (ichimonji10)]

Well, I'm going back to school for another five weeks. I'm not really a coder, so I'll leave it to others to look into source code and such. However, I do have a few more ideas for tests that can be performed.

This entire bug is predicated on the idea that a certain type of encryption wreaks havoc with Ubuntu's ability to use Wireless. So, I would perform some tests whereby a WAP is set to use several types of encryption, such as WEP and various WPA flavors. The test outcome should look something like this:

Location 1
WEP: n dB
WPA: n dB
WPA TKIP: ndB
WPA2: n dB

Location 2
WEP: n dB
WPA: n dB
WPA TKIP: ndB
WPA2: n dB

And so on. If anyone else wants to do some testing, feel free. Otherwise, wait a few weeks and I'll do it myself.

[Benjamim (bbbenjy-gmail)]

Same problem here, not solving Security Type : TKIP. Windows 7, no problem, you just have to write the PIN and the PASSWORD, it is an Ubuntu BUG !!!
bbbenjy

[Edward Liang (edward-k-liang)]

At several points, I had it working somehow after messing around for a bit. However, it would break whenever I suspended my computer. Once, after resuming, the system reported an error of the wpa_supplicant. Perhaps it is an issue with that.

[linusr (linusr)]

http://techviewz.org/2009/06/how-to-configure-ubuntu-810-904-for.html

looks Ubuntu ships without TKIP support... should this be in known issues list?

[Adam Niedling (krychek)]

Could a developer confirm that Ubuntu does not support TKIP?

[Alek (alek-andric)]

I'm having the same problem:

- disconnect every 30 secs or so, then automatically connects again for 30 sec, then disconnects, and so forth
- win xp works fine
- using WPA-PSK, TKIP
- on Intel PRO/Wireless 3945ABG Net
- laptop lenovo 3000 N200 0769
- Ubuntu 10.04 64bit
- this is in the office, on WEP everything works fine (at home)

[Smot (smot-msn)]

This has not been fixed in 10.04 - drop outs still occur regularly.

Is anyone from the kernel team actually looking into this at all?

I'm fed up having to boot into Windows just to post messages like this!

[Nick R S (nrselleh)]

Symptoms are in line with what was listed above

I run Mint 9 released 5-18-2010

Intel WiFi Link 5100AGN w/ bluetooth.

P.S. Wireless has worked flawlessly in my HP laptop in Win Vista, Win 7, and Ubuntu 9.04... so whats going on here?

Please Email me if you want me to do some diagnostics or anything on my machine, I want to be a part of the solution.

[Paul Engel (paul-cyberengel)]

I recently did a fresh install on Lucid and this is killing me. I'm near the WAP (Network Manager shows between 80-90%) and without moving the connection will drop. Sometimes it will reconnect other times I have to restart networking or network-manager.

The exact same laptop in the exact same location running Win 7 does not have this problem. I'm using a d-link WAP & WEP security (my wife has an older laptop that doesn't support WAP).

[Thomas Lauber (laubertom)]

Same thing here.
Ubuntu 9.10
ASRock ION HT-BD with AR9285 Wireless Network Adapter (PCI-Express) from Atheros Communications.
D-Link DIR 625 Router, WPA/WPA2 Security

I permanently see the wireless symbol but most of the time have no traffic.

[Marcelo Magalhaes (m-maga)]

Same here, disconnecting from 1 to 15 minutes among them. The reconnection works ok.

The OS is Ubuntu 10.04 lucid x32, using kernel 2.6.32-22.35, network-manager 0.8-0ubuntu3, wpasupplicant 0.6.9-3ubuntu3 and b43-fwcutter 1:012-1build1.

The device is:
Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
Subsystem: Hewlett-Packard Company Device 1355
Flags: bus master, fast devsel, latency 64, IRQ 20
Memory at c0204000 (32-bit, non-prefetchable) [size=8K]
Kernel driver in use: b43-pci-bridge
Kernel modules: ssb

My AP is Linksys WRT54G using Tomato 1.27 firmware, WPA/WPA2 + TKIP/AES security.

Wireless connection worked really nice from Ubuntu 7.04 to 9.04.

It works ok using Windows-XP.

[Marcelo Magalhaes (m-maga)]

As I am done observing 3 cycles of reconnection, I am sending a syslog attachment. I hope it can help.

[Marcelo Magalhaes (m-maga)]

When I realized the kernel was breaking the connection (syslog-3cycles.txt), I decided to give a try for ndiswrapper + windows driver for my wireless card. I followed the discussion here http://art.ubuntuforums.org/showthread.php?p=9391464.

I removed b43-fwcutter and installed bcmwl-kernel-source + ndiswrapper-utils-1.9 + Broadcom BCM4318 driver for Windows XP. In addition I blacklisted b43, b43legacy and ssb kernel modules in /etc/modprobe.d/blacklist.conf and added "alias wlan0 ndiswrapper" in /etc/modprobe.d/ndiswrapper.conf.

The connection is pretty stable, without reconnection. This is not a solution, it is just a work-around to keep wireless working. So I am sending you a syslog with come recurrent events done by network-manager and wpa_supplicant.

[Marcelo Magalhaes (m-maga)]

Bad news everyone. The wireless connection was working ok until yesterday. Nework-manager kept reconnecting today after I started using Google Docs. I am sending the syslog where you can observe the reconnection occurs by the event "wpa_supplicant[837]: CTRL-EVENT-CONNECTED". Please inform if I can contribute in a better way.

[akhalfan (akhalfan)]

I'm joining the party as well..although for me Karmic was working fine. The problem only happened when I upgraded to Lucid, I do indeed notice that the signal is lower, and if there are other wireless networks (where I live there are more like 7) it keeps dropping every few minutes

[akhalfan (akhalfan)]

btw, this didn't help
sudo apt-get install linux-backports-modules-wireless-2.6.32-21-generic

[Arne Kjell Vikhagen (arnekjell)]

Hi,

I got the same problem, seems to occur when I'm watching streamed movies using flash. Weird, but putting the computer in suspend and waking it up again work better than restarting network-manager.

Using Thinkpad T60 with lucid. Never had this problem with Karmic.

[Ernesto Rapetti (erapetti)]

I also got the same connection drop problem with Lucid and WPA2(TKIP). Switching to WPA2(AES) or disabling authentication in the wireless access point solved the issue.

Client is an Acer notebook with PRO/Wireless 3945ABG interface. Tried with kernel 2.6.31-22-generic and 2.6.32-23-generic
Access point is Planet WAP-4035

At the same time a Toshiba with Atheros AR5001X+ interface and kernel 2.6.28-11-generic (karmic) connects without problem to the same access point.

[Jeremy Audet (ichimonji10)]

Upgraded to Lucid and have not experienced this problem since. Thank you to whoever fixed this! Cautiously removing myself from this bug listing. :)

ichimonji10@ichimonji10-laptop:~/Documents$ cat /proc/net/wireless
Inter-| sta-| Quality | Discarded packets | Missed | WE
 face | tus | link level noise | nwid crypt frag retry misc | beacon | 22
 wlan0: 0000 49. -61. -256 0 0 0 0 0 0

Signal level was formerly approx -80 dB at this same location. And yes, I'm definitely using WPA TKIP:

ichimonji10@ichimonji10-laptop:~/Documents$ iwlist wlan0 scanning | grep WPA
                    IE: IEEE 802.11i/WPA2 Version 1
                    IE: WPA Version 1

[Emerson Prado (emerson-prado-eng)]

"Me too" with 10.04 (I can't get used to the fancy names), kernel 2.6.32-24-generic, manual configuration thru /etc/network/interfaces (no NM or other), D-Link DWL-G510 card (Ralink RT2561/RT61 chipset) and ECS M810LR 7.1a mobo (SiS730S chipset). I'm using a WEP protected network, in "managed" mode, in an office with half a dozen Windoze machines. All of them connect well.
Connection just drops after a long while sitting idle (probably less than an hour). ifdown and ifup bring it back to life, just to fall again later.

This computer used to have Win 2k and a TrendNet TEW-228PI wireless card. Then I installed Ubuntu 6.06, then upgraded to 8.04, and it was OK. I wanted to test 10.04 but the TrendNet board is unsupported and I didn't want to use ndiswrapper. So both the card and the OS were changed at once. Then it became unstable.

The signal is also quite low. I got -60dBm here, while another machine, twice as far from the router and in a less favourable angle, is around -50dBm. It definitely seems 10.04 (probably 9.10 too) is messing the signal. Would it be the kernel driver?

Thinking about downgrading to 8.XX or 9.04.
Best regards all,
Emerson

[nafraf (nafraf)]

My connection was dropping, with Ubuntu 10.04, wireless netcard BCM4312.
0e:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01)

  To solve the problem, I had to install the sta driver, from source code, following the next post:
http://ubuntuforums.org/showthread.php?t=1390979

[Alek (alek-andric)]

Good news! Upgraded to 10.10 and everything works perfectly :-) Great work dev team, thanks!

[Smot (smot-msn)]

Two complete days on 10.10 with no loss of wifi, so it's looking very promising.....
:-)

[Adam Niedling (krychek)]

I just tried it and my connection has been stable for hours! Great! This was my most "popular" bug report.
I'm closing this now, if someone is still experiencing it, I think a new report should be opened.