I found solution to this issue: This is the problem with DNS and this line from log file is a clue:
getaddrinfo(127.0.0.1,5900): Name or service not known DNS not working early enough during the boot . So when some virtual machines are trying to start up, but DNS service doesn't work at this moment and they fail. You can find more info at this mailing list: http://comments.gmane.org/gmane.comp.emulators.virt-tools/821 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/681703 Title: Domains don't start automatically after reboot a parent host To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/681703/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs