https://prahladyeri.com/blog/2017/09/how-to-trim-your-new-ubuntu-installation-of-extra-fat-and-make-it-faster.html https://askubuntu.com/questions/19320/how-to-enable-or-disable-services sudo update-rc.d $BROKEN_SERVICE_NAME disable it's work! https://askubuntu.com/questions/19320/how-to-enable-or-disable-services avahi = printing cups = printing in browser If you're feeling adventurous, and have already tried one of the other methods listed here, and have had problem, or if you're just impatient, you can try this. The Brute Force Method I have successfully used this to upgrade ubuntu installations over 4 major versions in one go, but proceed at your own risk. If you hit a snag, you might find it considerably harder to recover than with any of the other methods. naught101