torax@devnull:~$ sudo apt-get install nvidia-glx-legacy
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  nvidia-settings nvidia-legacy-kernel-source
The following NEW packages will be installed:
  nvidia-glx-legacy
0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
Need to get 0B/3063kB of archives.
After unpacking 10.0MB of additional disk space will be used.
(Reading database ... 137100 files and directories currently installed.)
Unpacking nvidia-glx-legacy (from .../nvidia-glx-legacy_1.0.7184+2.6.20.3-12.11_i386.deb) ...
dpkg-divert: `diversion of /usr/lib/libGL.so.1 to /usr/lib/nvidia/libGL.so.1.xlibmesa by nvidia-glx-legacy' clashes with `diversion of /usr/lib/libGL.so.1 to /usr/lib/fglrx/libGL.so.1.xlibmesa by xorg-driver-fglrx'
dpkg: error processing /var/cache/apt/archives/nvidia-glx-legacy_1.0.7184+2.6.20.3-12.11_i386.deb (--unpack):
 subprocess pre-installation script returned error exit status 2
Errors were encountered while processing:
 /var/cache/apt/archives/nvidia-glx-legacy_1.0.7184+2.6.20.3-12.11_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
torax@devnull:~$