$ sudo apt-get remove cvs
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  cvs
0 upgraded, 0 newly installed, 1 to remove and 2 not upgraded.
1 not fully installed or removed.
After this operation, 3670kB disk space will be freed.
Do you want to continue [Y/n]? yes
(Reading database ... 189461 files and directories currently installed.)
Removing cvs ...
Ignoring nonregistered document `cvs-doc-client'
Ignoring nonregistered document `cvs-doc'
install-info: No dir file specified; try --help for more information.
dpkg: error processing cvs (--remove):
 subprocess pre-removal script returned error exit status 1
Errors were encountered while processing:
 cvs
E: Sub-process /usr/bin/dpkg returned an error code (1)