Following the analysis above, I found that adding --removepkg binfmt- support allows the ubuntu-desktop package to be installed successfully, just in case anyone needs a quick workaround.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/497258 Title: vmbuilder fails when adding package 'ubuntu-desktop' -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs