Comment 41 for bug 116897

Ok, this happened some time ago to me when libvirtd sigfaulted, but the
bridge was
up and didn't went down. brctl didn't help me so to remove this bridge the
only way
I found was to reboot.

Try to debug it by:
disabling auto start on /etc/default/libvirt
reboot

Then
$ sudo libvirtd -v

This should start libvirtd on verbose mode.
When you use virt-manager the console with libvirtd should print
informations
about some operations.

Post the results here. Try to use the new package, it is built already.

> Not sure if this helps. I have two laptops with the same configuration.
> I.e.
> I started with the same version from the ppa repo. They have recently been
> upgraded. They never used to have the bridge problem before the package
> upgrades. Something must have changed. I must say that you only notice the
> brigde issue if you are restarting the service at the command line. When
> its
> all working and you boot up, you dont notice it.
>
> --
> [needs-packaging] virt-manager
> https://bugs.launchpad.net/bugs/116897
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>