$ sudo apt-get remove rtirq-init 

Uninstall rtirq-init including dependent package

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

$ sudo apt-get remove --auto-remove rtirq-init 

Use Purging rtirq-init

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

$ sudo apt-get purge rtirq-init 

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 rtirq-init 

See Also,