* Verify old directory/files exist
ll /usr/lib/monitorix; ll /var/lib/monitorix ll /etc/monitorix; ll /usr/share/doc/monitorix*;
* If they exists, execute
rm -rf /usr/lib/monitorix; rm -rf /var/lib/monitorix rm -rf /etc/monitorix; rm -rf /usr/share/doc/monitorix*;
* If they do not exist, no further action is necessary.
This should have no adverse affects on the currently installed version providing it's 3.7 or greater.