I have just installed Ubuntu 14.04 on my old Sony Vaio VGN-SZ 90PS which has a Geforce Go 7200 card. I do not know the first thing about ubuntu or linux in general, am not an IT professional or programmer or in any way technically gifted, so please help me with childishly detailed instructions.
The initial installation went fine, however the Unity desktop screen appeared in a generic 4:3 / 1024:780 resolution while the display is built for 1280 x 800. The resolution drop-down menu did not offer that resolution as an option. So I went to software updates and chose the nvidia driver (304.125) that was shown as "tested". After reboot, the log-in screen appears in the correct resolution. After entering my user password, for a few seconds a blank desktop appears (no side bar, no icons of any kind but the Ubuntu wallpaper). After those few seconds the screen goes black. The mouse cursor is still visible but that's it. No reaction to anything I try, the screen stays empty and black.
And yes, I can get into command line mode with Ctrl+Alt+F1.
Please advise what I need to do.