My take is if you don't have Agent then you need to make an Electronics(Computer) check to operate your computer.
Some tasks will be so trivial however that even -3 for being unskilled won't be a significant impediment (especially if you take your time). Accessing the planetary dataweb for public information is an Easy(4+) check. So an unskilled person of average INT or EDU will succeed over half the time (needs 7+). Or the majority of the time (need 5+) if they spend 10 times as long. It depends on the impact of your failing.
If you are accessing a public information system (i.e. a library's help system rather then Googling something) you might make that an Admin check instead as it is about filling in the form to take you through a system designed to help rather than being able to correctly phrase the query for a search engine. Or it might require a computer check but with a boon (or bane if the interface is particularly obtuse).
Some public information systems will doubtless have an integrated Agent to make things easy for the non-technical (and reduce the pressure on the call centre). Once you are making those Easy searches with no penalty you can't really fail, the worst case is it might take you longer (because you couldn't resist clicking on that You Tube cat video and then got sucked in).
As you don't have to rely on that -2DM from EDU (assuming his INT DM isn't worse) for most normal tasks losing the -3 for unskilled will make a significant difference and Agent-0 will mean they can just ask their mobile to do the work for them (and bypass any stat DM).
They'll be fine (until the battery fails)