$ sudo apt-get remove fookb-plainx 

Uninstall fookb-plainx including dependent package

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

$ sudo apt-get remove --auto-remove fookb-plainx 

Use Purging fookb-plainx

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

$ sudo apt-get purge fookb-plainx 

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 fookb-plainx 

See Also,