Error message to run "apt-get install -f" should include sudo

For 16.04, aptdaemon version 1.1.1+bzr982-0ubuntu14, the _DESCS_ERROR[ERROR_CACHE_BROKEN] message in enums.py is:

Check if you are using third party repositories. If so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f

This command should be prefixed with sudo as its omission is confusing users, for example http://askubuntu.com/q/816626/425479.