Comment 67 for bug 173418

>>>I have the same problem. When I reboot, x server tries 3 times to start and then it switches to safe graphics
>>>mode (vesa, 800x600). When I hit "test" and manually select "nv" driver, it really works in
>>>test. However, when I continue, it somehow switches back to vesa.
Same problem.

Black list the nv driver in the "/etc/default/linux-restricted-modules-common" and reinstall nvidia driver works for me