Comment 10 for bug 1376966

Looking at the description:

After some debugging I fond that this was done by gpu-manager, because it incorrectly believes that my nvidia module is blacklisted. gpu-manager.log contained "Is nvidia blacklisted? yes".

More debugging determined that this was happening because I have a several years old file named:
  /etc/modprobe.d/blacklist.dpkg-old
which among other things contain the line "blacklist nvidia".

It looks to me like the test case would involve creating a file name blacklist.dpkg-old in /etc/modprobe.d and installing the buggy version of ubuntu-drivers-common and reviewing gpu-manager.log file for "Is nvidida blacklisted? yes". With the version of the package from -proposed you should not see that line in the gpu-manager.log file.