Can you please try "sudo apt-get -f install" see if it fixes the depends problems. Just FYI ubuntu doesnt really support non ubuntu packages and this is why update-manager may not be fixing them for you. I will however see the right people get informed about this bug. thank you for your bug report.
** Changed in: Ubuntu Status: Unconfirmed => Needs Info ** Changed in: Ubuntu Sourcepackagename: None => update-manager -- Upgrade failed w. non-Ubuntu libgl1-mesa package https://launchpad.net/bugs/74885 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs