$ sudo apt-get remove camera.app 

Uninstall camera.app including dependent package

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

$ sudo apt-get remove --auto-remove camera.app 

Use Purging camera.app

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

$ sudo apt-get purge camera.app 

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 camera.app 

See Also,