Edubuntu DVD livefs builds failed because of lxc failing to install

Setting up lxc (0.7.5-3ubuntu43) ...
Warning: unable to find a suitable fs in /proc/mounts, is it mounted?
Use --subdomainfs to override.
dpkg: error processing lxc (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of arkose:
 arkose depends on lxc; however:
  Package lxc is not configured yet.
dpkg: error processing arkose (--configure):
 dependency problems - leaving unconfigured
Setting up python-configobj (4.7.2+ds-3build1) ...
/bin/df: cannot read table of mounted file systems: No such file or directory
No apport report written because the error message indicates its a followup error from a previous failure.
dpkg: dependency problems prevent configuration of arkose-gui:
 arkose-gui depends on arkose; however:
  Package arkose is not configured yet.
dpkg: error processing arkose-gui (--configure):
 dependency problems - leaving unconfigured

Full log at: http://people.canonical.com/~ubuntu-archive/livefs-build-logs/precise/edubuntu-dvd/20120322/livecd-20120322-i386.out