Instead of the (fairly useless) "Make sure the installation sources are valid and restart the installation", the error could have said "More information can be found in X:\...\setupact.log" which would have been more useful to a person technical enough to read it, and equally useless for the few non-technical users who will ever encounter this error.
This applies to many errors that just tell you what failed with generic steps that might help instead of actual useful information.
Though in fairness, I believe though the most common cause for an error in that path would be a problem with the installation media, and probably more likely to be checksum errors on an optical drive, or perhaps corruption on the machine capturing the WIM file, or even a bad drive on the target machine -- all of these are much more likely that than someone stuffing a Linux image onto installation media.. So I could see a message geared towards that.
When I was responsible for the WIM code, I got pinged with a lot of noise from people all over Microsoft installing Windows onto bad disks. They usually thought they hit setup bugs.