matt:0(j0,d1)[~]> sudo aptitude install nvidia-source
Reading package lists... Done
Building dependency tree... Done
Reading extended state information       
Initializing package states... Done
Reading task descriptions... Done  
Building tag database... Done    
Couldn't find any package whose name or description matched "nvidia-source"
The following packages have been kept back:
  adduser bash findutils gtk-engines-industrial gtk2-engines iceweasel 
  initramfs-tools mc phpdoc qemu tcltls xterm 
0 packages upgraded, 0 newly installed, 0 to remove and 12 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
matt:0(j0,d1)[~]>