I just upgraded to 12.04 through Upgrade Manager and the system is now unusable (after a fresh install of 11.10 had been working perfectly for 4 months.) When I log in, the icons on the Unity menu do not load. When I open the Unity menu using the Windows key, I can search and see results but again the icons do not appear. The top bar only displays my user name and the other icons appear only as 'Xs'. Most importantly, I cannot move the pointer using my trackpad or wireless USB mouse. The window switching menu does not appear when I press Ctrl+Shift so I have no way to get into the terminal to try any troubleshooting. I realize 12.04 just came out today but has anyone else experienced problems like this?
Hardware: HP Pavilion laptop. Intel Centrino processor, Intel graphics.