$ sudo apt-get remove pychecker 

Uninstall pychecker including dependent package

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

$ sudo apt-get remove --auto-remove pychecker 

Use Purging pychecker

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

$ sudo apt-get purge pychecker 

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 pychecker 

See Also,