xorg is a dependency of ubuntu-desktop; this metapackage must be installed in order to ensure that all of the proper packages are installed for desktop functionality. Update Manager copes with this automatically and this is one reason why it is the officially recommended upgrade path.
** Changed in: Ubuntu Status: Needs Info => Rejected -- X server fails after upgrade Dapper > Edgy https://launchpad.net/bugs/58326 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs