Removing nvidia-glx-legacy ...
Purging configuration files for nvidia-glx-legacy ...
dpkg-divert: mismatch on package
  when removing `diversion of /usr/lib/libGL.so.1 to /usr/lib/nvidia/libGL.so.1.xlibmesa by nvidia-glx-legacy'
  found `diversion of /usr/lib/libGL.so.1 to /usr/lib/nvidia/libGL.so.1.xlibmesa by nvidia-glx'
dpkg: error processing nvidia-glx-legacy (--purge):
 subprocess post-removal script returned error exit status 2
Errors were encountered while processing:
 nvidia-glx-legacy