EXTREMELY IMPORTANT:

    *

      . Enter the command exactly as above, so the  dist-upgrade  step will run only if the  update  step is successful. If the first step fails but you still attempt to run the second step, you will probably end up with a corrupted system.
    *

      . Make sure you type  dist-upgrade  rather than  upgrade , because  upgrade  will totally hose your machine and render it completely unbootable. This is because a normal upgrade won´t upgrade packages with uninstalled dependencies, meaning your system will end up half Breezy and half Dapper.