# dpkg --purge ssh
(Reading database ... 19057 files and directories currently installed.)
Removing ssh ...
Purging configuration files for ssh ...
rmdir: unrecognized option `--ignore-fail-on-non-empty'
BusyBox v1.6.1 (2007-09-27 18:08:59 EEST) multi-call binary

Usage: rmdir [OPTION]... DIRECTORY...

dpkg: error processing ssh (--purge):
 subprocess post-removal script returned error exit status 1
Errors were encountered while processing:
 ssh