Upgrade to Ubuntu 15.10 Broken: lxc-net.service fails on upgrade

[md_5]

With lxc installed, the 15.04 -> 15.10 upgrade fails. The upgrade completes if LXC is removed and then reinstalled later. Here is me using apt to try and make it work (gives same errors as upgrade-manager did):

Setting up lxc (1.1.4-0ubuntu1) ...
Job for lxc-net.service failed because the control process exited with error code. See "systemctl status lxc-net.service" and "journalctl -xe" for details.
invoke-rc.d: initscript lxc-net, action "start" failed.
dpkg: error processing package lxc (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of lxc-templates:
 lxc-templates depends on lxc (>= 0.8.0~rc1-4ubuntu43); however:
  Package lxc is not configured yet.

dpkg: error processing package lxc-templates (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 lxc
 lxc-templates
E: Sub-process /usr/bin/dpkg returned an error code (1)
╭─michael@michael-desktop-ubuntu ~ ‹›
╰─$ systemctl status lxc-net.service 100 ↵
● lxc-net.service - LXC network bridge setup
   Loaded: loaded (/lib/systemd/system/lxc-net.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2015-10-22 12:50:07 AEDT; 27s ago
  Process: 22655 ExecStart=/usr/lib/x86_64-linux-gnu/lxc/lxc-net start (code=exited, status=1/FAILURE)
 Main PID: 22655 (code=exited, status=1/FAILURE)

Oct 22 12:50:07 michael-desktop-ubuntu systemd[1]: Starting LXC network bridge setup...
Oct 22 12:50:07 michael-desktop-ubuntu lxc-net[22655]: lxc-net is already running
Oct 22 12:50:07 michael-desktop-ubuntu systemd[1]: lxc-net.service: Main process exited, code=exited, status=1/FAILURE
Oct 22 12:50:07 michael-desktop-ubuntu systemd[1]: Failed to start LXC network bridge setup.
Oct 22 12:50:07 michael-desktop-ubuntu systemd[1]: lxc-net.service: Unit entered failed state.
Oct 22 12:50:07 michael-desktop-ubuntu systemd[1]: lxc-net.service: Failed with result 'exit-code'.

[Martin Pitt (pitti)]

At first sight I thought this was a duplicate of bug 1504897, but that doesn't seem to be it. If lxc-net.service fails, then the problem is something else.

[Serge Hallyn (serge-hallyn)]

Please show the results of

sudo systemctl status lxc-net.service
sudo journalctl -u lxc-net
sudo journalctl -xe
ifconfig -a
cat /etc/default/lxc-net

[Adam Stokes (adam-stokes)]

I hit this too, I actually just had to run:

/usr/lib/x86_64-linux-gnu/lxc/lxc-net stop

And it seemed to put itself back into a state that systemd could work with

[Serge Hallyn (serge-hallyn)]

Was yours also on an upgrade from vivid to wily? Were you using the stock archive lxc packages? Any customizatoin of the lxc-net configuration?

[md_5 (md-5)]

Info is attached. Note that it is from 15.10 and working fine.

[Julian Edwards (julian-edwards)]

I was getting this too. I say was, because Adam's tip helped me resolve it. I'll also note that this is on a machine still running vivid.

[Robie Basak (racb)]

I hit what I think might be this issue on Vivid, just doing an upgrade to the latest lxc in vivid-updates because I was hitting a separate bug (I'll file next) and thought updating to the latest vivid-updates might fix it. In my case, "service lxc-net stop" succeeded, but "service lxc-net start" still did not work. Rebooting fixed it.

I didn't keep many logs (sorry), but the original versions on Vivid and the versions I upgraded to were:

Commandline: apt-get install lxc
Upgrade: lxc:amd64 (1.1.2-0ubuntu3, 1.1.5-0ubuntu0.15.04.3), python3-lxc:amd64 (1.1.2-0ubuntu3, 1.1.5-0ubuntu0.15.04.3), liblxc1:amd64 (1.1.2-0ubuntu3, 1.1.5-0ubuntu0.15.04.3)
Error: Sub-process /usr/bin/dpkg returned an error code (1)

So perhaps this might be reproducible from a Vivid machine that is on the release pocket only, adding the -updates pocket and then "sudo apt-get install lxc". I haven't tried this though.

I hope that's helpful.

[Serge Hallyn (serge-hallyn)]

Tried to reproduce by installing lxc version from vivid release, then upgrading to -updates, but it worked fine :(

[Launchpad Janitor (janitor)]

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