Zorin 16.3 pro update to 17 pro

It may be that the servers are overloaded as too many attempt to upgrade at the same time... or it may be:

Keep in mind that the post is for Zorin OS 16.3, so you'd have to substitute 'jammy' for 'focal', in addition to substituting 'https://ppa.launchpadcontent.net' for 'http://ppa.launchpad.net'.