$ sudo apt-get remove cil 

Uninstall cil including dependent package

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

$ sudo apt-get remove --auto-remove cil 

Use Purging cil

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

$ sudo apt-get purge cil 

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 cil 

See Also,