$ sudo apt-get remove gav 

Uninstall gav including dependent package

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

$ sudo apt-get remove --auto-remove gav 

Use Purging gav

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

$ sudo apt-get purge gav 

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 gav 

See Also,