$ sudo apt-get remove libgd3 

Uninstall libgd3 including dependent package

If you would like to remove libgd3 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libgd3 

Use Purging libgd3

If you use with purge options to libgd3 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libgd3 

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 libgd3 

See Also,