$ sudo apt-get remove grcm 

Uninstall grcm including dependent package

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

$ sudo apt-get remove --auto-remove grcm 

Use Purging grcm

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

$ sudo apt-get purge grcm 

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 grcm 

See Also,