I recently upgraded my desktop mac to Precise and now can't get past the Ubuntu 12.04 splash page. The splash freezes with Ubuntu and the dots turning from white to orange forever.
This is when I choose 3.2.0-generic from the grub menu. If I choose to load up older kernels, I still get the same thing.
How can I make my computer finish booting again?
I'm able to ssh into the machine and poke around, but the actual screen freezes at the splash.
If I understand it right then the Desktop Manager tries to start before your NVidia card is setup properly. It is an Ubuntu 10.04 Bug with MacBooks - but could be same problem with your hardware.At least I would give it a try ...
According to the answers here you should try the following:
a) adding some more time for your NVidia card to load
OR
b) editing
editing /etc/init/gdm.conf and /etc/init/kdm.conf
More details and what to change exactly and how you will find here:
KDM Bug in Ubuntu with NVidia