apt-get install nvidia-glx
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  nvidia-kernel-source
The following packages will be upgraded:
  nvidia-glx
1 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0B/4492kB of archives.
After unpacking 160kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  nvidia-glx
Authentication warning overridden.
(Reading database ... 83399 files and directories currently installed.)
Preparing to replace nvidia-glx 1.0.9755-1mepis1 (using .../nvidia-glx_1%3a1.0.9631+2.6.20.5-16.29_i386.deb) ...
/var/lib/dpkg/info/nvidia-glx.prerm: line 24: /etc/init.d/nvidia-glx: No such file or directory
dpkg-divert: `diversion of /usr/lib/xorg/modules/libglx.so to /usr/lib/nvidia/libglx.so.xlibmesa by nvidia-glx' clashes with `diversion of /usr/lib/xorg/modules/extensions/libglx.so to /usr/lib/nvidia/libglx.so.xlibmesa by nvidia-glx'
dpkg: error processing /var/cache/apt/archives/nvidia-glx_1%3a1.0.9631+2.6.20.5-16.29_i386.deb (--unpack):
 subprocess pre-installation script returned error exit status 2
Errors were encountered while processing:
 /var/cache/apt/archives/nvidia-glx_1%3a1.0.9631+2.6.20.5-16.29_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)