I have problems with bumblebee installation on Ubuntu 12.04, when I use this code to install it, I got this message in terminal:
Reading package lists... Done Building dependency tree Reading state information... Done Package bumblebee is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'bumblebee' has no installation candidate E: Unable to locate package bumblebee-nvidia
Last 2 lines are problematic.
Thanks in advance,