If you are having problems with nvidia drivers and the new kernel RC then fooman has the answer.
Re: Kernel 3.7-rc1
lost the nvidia drivers when i first booted up (GTX480), no top panel or unity....had to right-click on desktop to open terminal. from there i opened firefox and got the command to install the x-edgers PPA:
ran that, then opened synaptic from the terminal (sudo synaptic), updated the repos, let it install all updates plus the edgers nvidia-current (vers. 310.14). rebooted and all is well:
sudo add-apt-repository ppa:xorg-edgers/ppa
jackel@jackel-GA-990FXA-UD5:~$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=12.10 DISTRIB_CODENAME=quantal DISTRIB_DESCRIPTION="Ubuntu 12.10" jackel@jackel-GA-990FXA-UD5:~$ uname -r 3.7.0-030700rc2-generic