Looks like that was the problem. I'm a newbie on this and didn't see any
reference to the importance of explicit package selection- I assumed
that the repositories steered you to the correct place. Would it be
sensible/practical to state on the Ubuntu/docker install pages that
s390x images must be
This appears to be because "hello-world" is an amd64 image and you
appear to be on an s390x system -- can you try "s390x/hello-world"
instead? :)
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https://bugs.launchpad.net/bugs/1603244