Ubuntu 12.04 alpha 1 network flaky after update

Bug #917399 reported by Dan Kegel
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
network-manager (Ubuntu)
Expired
Undecided
Unassigned

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.

Tags: bot-comment
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

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tags: added: bot-comment
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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 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
default 192.168.0.1 0.0.0.0 UG 100 0 0 wlan0
link-local * 255.255.0.0 U 1000 0 0 eth0
192.168.0.0 * 255.255.255.0 U 0 0 0 wlan0
192.168.0.0 * 255.255.255.0 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
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 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)
Revision history for this message
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"

Revision history for this message
Dan Kegel (dank) wrote :

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

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ibidem (ibid-ag) wrote :

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

Revision history for this message
Mathieu Trudel-Lapierre (cyphermox) wrote :

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
Revision history for this message
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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