*** This bug is a duplicate of bug 58424 *** I had this problem as well. For me, it was caused by conflicting packages. I'm uploading my relevant log file.
** Attachment added: "See the bottom -- cannot install ubuntu-desktop because of conflicting packages." http://librarian.launchpad.net/4891277/main.log -- Can't install 'ubuntu-desktop' https://launchpad.net/bugs/63205 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs