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docker system prune --all -f docker image prune -f --all --filter "until=1h"  

sudo snap remove skype  or Uninstall mahjongg  To remove just mahjongg package itself from Ubuntu 16.04 (Xenial Xerus) execute on terminal:  sudo apt-get remove mahjongg  Uninstall mahjongg and it's dependent packages  To remove the mahjongg package and any other dependant package which are no longer needed from Ubuntu Xenial.  sudo apt-get autoremove mahjongg  Purging mahjongg  If you also want to delete configuration and/or data files of mahjongg from Ubuntu Xenial then this will work:  sudo apt-get purge mahjongg  To delete configuration and/or data files of mahjongg and it's dependencies from Ubuntu Xenial then execute:  sudo apt-get autoremove --purge mahjongg