After installing that older 12.4 driver (as I mentioned in the above comment) I opened the AMD control panel (before rebooting. If I reboot, i'll loose unity) and it gave me an error saying there's no AMD graphic driver installed. (But note that it worked in Ubuntu 12.04) Attached a screenshot of the error.
** Attachment added: "AMD catalyst error" https://bugs.launchpad.net/fglrx/+bug/1068661/+attachment/3405679/+files/error.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1068661 Title: Unity does not load after installing fglrx-installer To manage notifications about this bug go to: https://bugs.launchpad.net/fglrx/+bug/1068661/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs