$ sudo apt-get remove dis51 

Uninstall dis51 including dependent package

If you would like to remove dis51 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove dis51 

Use Purging dis51

If you use with purge options to dis51 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge dis51 

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 dis51 

See Also,