Oops, I just found this in the debian bugs: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550845
And by chance, the same problem has occurred in my case: I had installed the "cgroups-bin" package for testing purposes today, too. And this made my vms fail. I uninstalled the package and now they work again. Sorry for the noise! But maybe the coincidence is interesting? ** Bug watch added: Debian Bug tracker #550845 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550845 ** Changed in: virt-manager (Ubuntu) Status: Confirmed => Invalid -- Error starting domain: Unable to deny all devices for vm0: No such file or director https://bugs.launchpad.net/bugs/440015 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs