This is not a bug in ia32-libs. You have an unofficial version of the libx11-6 package installed:
Remv libx11-6 [2:1.5.0-1ubuntu1] [gvfs:amd64 ] If you install packages from a ppa and then disable that ppa, you should use the 'ppa-purge' command to restore your system to the standard set of packages, because multiarch libraries must be at the same version on each architecture and if the package is no longer available, the package manager has no choice but to do things like this to satisfy requests. ** Changed in: ia32-libs (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1144929 Title: Unknown dependency of ia32-libs breaks 64-bit Raring installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ia32-libs/+bug/1144929/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs