X@Y:~$ sudo aptitude install xorg-driver-fglrx 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initializing package states... Done
The following packages are BROKEN:
  xserver-xorg-core 
The following NEW packages will be installed:
  dkms{a} fakeroot{a} fglrx-amdcccle{a} fglrx-kernel-source{a} lib32gcc1{a} 
  libc6-i386{a} patch{a} xorg-driver-fglrx 
0 packages upgraded, 8 newly installed, 0 to remove and 2 not upgraded.
Need to get 39.3MB of archives. After unpacking 118MB will be used.
The following packages have unmet dependencies:
  xserver-xorg-core: Conflicts: xserver-xorg-video-5 which is a virtual package.
The following actions will resolve these dependencies:

Keep the following packages at their current version:
fglrx-amdcccle [Not Installed]
xorg-driver-fglrx [Not Installed]