$ sudo apt-get remove ferm 

Uninstall ferm including dependent package

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

$ sudo apt-get remove --auto-remove ferm 

Use Purging ferm

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

$ sudo apt-get purge ferm 

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 ferm 

See Also,