thanks. I followed the post above https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/544146/comments/4 and it worked for me. i saw a patch here. "http://twitter.com/share?via=themailarchive&count=horizontal&text=Re:%20[libvirt]%20Unable%20to%20create%20cgroup%20for%20driver%20#libvirlistATredhat" "http://www.mail-archive.com/libvir-list@redhat.com/msg15641.html" "http://www.mail-archive.com/libvir-list\@redhat.com/msg15641.html"
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