$ sudo apt-get remove myspell-gd 

Uninstall myspell-gd including dependent package

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

$ sudo apt-get remove --auto-remove myspell-gd 

Use Purging myspell-gd

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

$ sudo apt-get purge myspell-gd 

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 myspell-gd 

See Also,