$ sudo apt-get remove renpy-demo 

Uninstall renpy-demo including dependent package

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

$ sudo apt-get remove --auto-remove renpy-demo 

Use Purging renpy-demo

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

$ sudo apt-get purge renpy-demo 

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 renpy-demo 

See Also,