Comment 3 for bug 545302

Just a note to help others -- during my latest dist-upgrade, I was prompted whether or not I wanted to overwrite a particular kvm-related file to add another permissions line for seabios. I was worried about losing other customizations to this file and declined -- neglecting to write down the important change. (Lesson: don't do these things late at night when you're tired!)

This of course caused all my virtual machines to refuse to start with the errors shown above. It took QUITE awhile for me to find the file I had to change manually, and it's such a simple change.

You must edit /etc/apparmor.d/abstractions/libvert-qemu and add the following line (after line 63, if you haven't already added lines beyond the standard definition); it will be right after a nearly identical line for vgabios:

  /usr/share/seabios/** r,

After adding that line, my VMs were able to start right back up again!