Ubuntu 12.04 alpha 1 network flaky after update

Bug #917399 reported by Dan Kegel on 2012-01-16
This bug affects 2 people
Affects Status Importance Assigned to Milestone
network-manager (Ubuntu)

Bug Description

Testing 12.04 alpha 1 64 bit on my Asus G60JX laptop.
Worked well enough with previous versions ( http://kegel.com/linux/asus-g60jx-laptop.html ).

As with previous versions of Ubuntu, the Live CD / normal desktop installer couldn't get graphics right, so used alternate install iso, and had to specify "nomodeset" on kernel commandline after installation to get any graphics.
Was able to do a complete software update, then rebooted. After that, networking seemed flakier.
When I try downloading the nvidia display driver with "Additional Drivers", the download seems
to hang after a few seconds. Rebooting and retrying doesn't help.

There were several crashes, and apport collected data for them and even uploaded one of them, but I was unable to finish the login process at launchpad. I had to reboot to 11.04 to file this report.

This is all with wired networking, as wireless doesn't work at all.

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/917399/+editstatus and add the package name in the text box next to the word Package.

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tags: added: bot-comment
Dan Kegel (dank) wrote :

Also affects ubuntu 11.10.

Here's what was happening: my wifi interface was showing up as up but unmanaged (this
is a very fresh installation, so that's how the installer left it), and 'route' showed

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default UG 0 0 0 eth0
default UG 100 0 0 wlan0
link-local * U 1000 0 0 eth0 * U 0 0 0 wlan0 * U 1 0 0 eth0

The command 'ifconfig wlan0 down' fixed the problem! After that, the routing table was

Destination Gateway Genmask Flags Metric Ref Use Iface UG 0 0 0 eth0 U 1000 0 0 eth0 U 1 0 0 eth0

and everything was hunky-dory.

So the problem was that the installer left my system in an inconsistent
state: wlan0 was up but not managed, and acted as a packet /dev/null
35 seconds out of every 43 seconds.

affects: ubuntu → network-manager (Ubuntu)
Dan Kegel (dank) wrote :

Title of bug should be something like "installer and/or network manager mistakenly adds route via broken wlan0, causing intermittent complete packet loss"

Dan Kegel (dank) wrote :

See also bug 917402, which describes another symptom of the underlying disagreement.

ibidem (ibid-ag) wrote :

Proposing the linked bug report as a duplicate: If you have two symptoms of one problem, that's one bug.

This is incredibly messy.

Before marking bugs as duplicates, please attach all the necessary information and make sure a developer can review it. This is most certainly not a bug in NetworkManager if it's really about alternate installs and d-i setting configuration in /etc/network/interfaces.

Please, attach the /etc/network/interfaces file resulting in such an install.

Changed in network-manager (Ubuntu):
status: New → Incomplete
Launchpad Janitor (janitor) wrote :

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]

Changed in network-manager (Ubuntu):
status: Incomplete → Expired
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