I upgraded my 12.04->12.10->13.04->13.10 had troubles with nVidia card and installed latest 331 nVidia driver from PPA after that ubuntu stopped loading at all. It won't load even in safemode. xorg.0.log says that it can't find display 0 or device 0 (not sure). However, loading from bootable stick works. But I can't find how can I edit /etc/X11/xorg.conf if I loaded from stick - it just won't let me do it. What can I do in this situation?