yesterday I upgraded my perfectly working Ubuntu 12.04 to 12.10 and while booting for the first time, a window appeared saying it had to boot in low graphics mode because of not finding my configuration. In hopes of overcoming this problem, I upgraded through terminal to 13.04 butthe window still appears. I've tried many things such as reinstalling driver, modifying greeter entry and such, but nothing seems to work. I'm currently running an HP Pavilion dv4 with AMD Athlon x2 processor and ATI HD 3200 graphics. Please help me, I'm quite desperate.