Comment 7 for bug 724271

The following packages have unmet dependencies:
  libdrm-nouveau1: Breaks: xserver-xorg-video-nouveau (< 1:0.0.16) but 1:0.0.15+git20100219+9b4118d-0ubuntu5 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
tostr@tostr-desktop:~$
this is what i got after following these instructions https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure