$ sudo apt-get remove gpsbabel 

Uninstall gpsbabel including dependent package

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

$ sudo apt-get remove --auto-remove gpsbabel 

Use Purging gpsbabel

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

$ sudo apt-get purge gpsbabel 

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 gpsbabel 

See Also,