My understanding is that the Sage-9.3 and Sage-9.4 binaries are broken
on a large number of machines due to an issue with how openblas was
built. You probably have to use a sage-9.2 docker container, or wait
for sage 9.5 to come out.
<rant>Somebody probably should have deleted all sage-9.3 and 9.4
binaries from all download repos, announced widely about this problem,
and made an emergency 9.4.x release with the openblas fix in it and
nothing else. But since I'm not willing to do that work, who am I to
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