$ sudo apt-get remove gpac 

Uninstall gpac including dependent package

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

$ sudo apt-get remove --auto-remove gpac 

Use Purging gpac

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

$ sudo apt-get purge gpac 

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 gpac 

See Also,