bob@ubuntu:~$ sudo apt-cache policy nvidia-current
[sudo] password for bob:
nvidia-current:
  Installed: 270.41.06-0ubuntu1
  Candidate: 270.41.06-0ubuntu1
  Version table:
 *** 270.41.06-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ natty/restricted i386 Packages
        100 /var/lib/dpkg/status