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 Server Team, which is subscribed to vm-builder in Ubuntu. https://bugs.launchpad.net/bugs/497258 Title: vmbuilder fails when adding package 'ubuntu-desktop' -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs