I switched to GDM and restarted. No problem. Waited several days and my system is working well, except for a minor bug in Gnome 3.4. I install Ubuntu Tweak and make a few tweaks. Reboot and all is well. I run Cleanup in Ubuntu Tweak and clean everything up except for the previous kernel. Reboot and for the third time installing 12.04, Unity will not load. Log out and try Gnome. Gnome 3.4 will not load but Gnome classic does. The ATI video card is humming away.
I pull up a terminal and try Unity --reset, but I get numerous error messages and then it freezes.
Is there any way to fix this issue. Third time this has happened - I should have left it alone and not installed Ubuntu Tweak. Any help would really be appreciated.