$ sudo apt-get remove dtd-ead 

Uninstall dtd-ead including dependent package

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

$ sudo apt-get remove --auto-remove dtd-ead 

Use Purging dtd-ead

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

$ sudo apt-get purge dtd-ead 

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 dtd-ead 

See Also,