$ sudo apt-get remove mrtg-rrd 

Uninstall mrtg-rrd including dependent package

If you would like to remove mrtg-rrd and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove mrtg-rrd 

Use Purging mrtg-rrd

If you use with purge options to mrtg-rrd package all the configuration and dependent packages will be removed.

$ sudo apt-get purge mrtg-rrd 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove mrtg-rrd 

See Also,