Comment 7 for bug 1000174

Sorry, these should have been

sudo lxc stop
sudo lxc start

If you still care to debug and provide that output, that would be great.
But if you aren't using lxc anyway, and simply wish to remove it, you
can do:

sudo apt-get purge lxc

You can also leave lxc installed, but stop it from starting its own
network by setting USE_LXC_BRIDGE=false in /etc/default/lxc.

If you remove lxc, please let us know so we can update the bug
status accordingly.

thanks,
-serge