Comment 3 for bug 247445

IIUC, there are two errors we can check for and report: network failure and stale data. Eg, if we don't have a network failue, but we do have stale data, then give the severe message. If you do have a network failure/hiccup, report something less severe instead, possibly with an option for opting out of network failure warnings.

Another option is appropriate wording that says something like "Apt has detected stale data after performing an update of its cache. This could be the result of a transient network failure or an indication of a man-in-the-middle attack..." Of course, that is suboptimal if it happens *every time* there is a network hiccup.