Update blues

Install new kernel, and then reboot to start using it
Ubuntu boots but with the message:

Ubuntu is running in low graphics mode

Click "Ok"
Restart X
Click "Ok"

Ubuntu starts without any problem, but Desktop Effects (and all the added magic of having an NVIDIA card) are disabled...

Goto:

System > Administration > Hardware Drivers

Remove NVIDIA Accelerated Graphics Driver, and then reboot

Once is back online again, goto (once again...):

System > Administration > Hardware Drivers

Activate the NVIDIA Accelerated Graphics Driver, it will download it, and then proceed to install; then reboot.
Enjoy all the NVIDIA greatness once again.