$ sudo apt-get remove p11-kit 

Uninstall p11-kit including dependent package

If you would like to remove p11-kit and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove p11-kit 

Use Purging p11-kit

If you use with purge options to p11-kit package all the configuration and dependent packages will be removed.

$ sudo apt-get purge p11-kit 

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 p11-kit 

See Also,