$ sudo apt-get remove ircii 

Uninstall ircii including dependent package

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

$ sudo apt-get remove --auto-remove ircii 

Use Purging ircii

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

$ sudo apt-get purge ircii 

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 ircii 

See Also,