@Hendrik,
I suspect you left libvirt running while unmount the cgroup filesystems.
Libvirt prepares and caches info about the mounted cgrousp when it
starts up, and cannot handle changes.
Please try instead:
stop libvirt-bin
umount -a -t cgroup
start libvirt-bin
But actually, before you do that, coudl you tell me how the cgroups were
mounted? Do you have the cgroup-bin or cgroup-lite package installed,
or is it manually mounted with fstab? ('dpkg -l | grep cgroup' and
'cgroup cgroup /etc/fstab' should help)
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https://bugs.launchpad.net/bugs/787091
Title:
Unable to use USB device in KVM quest
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