Comment (by Roland Haas):

I just gave the instructions a try on a freshly installed and updated Ubuntu 20.04 VM. I could compile fine followign the instructions from the tutorial, which probably matches (mostly) with what Steve’s suggestion would achieve.

So: worksforme.

Since it clearly fails for you, one needs to find out why. Unfortunately the partial error output that was provided is not quite enough to do so. Instead the full build log would be helpful. Namely if you could attach the file make.log produced by:

make sim-realclean
VERBOSE=yes ./simfactory/bin/sim build -j1 sim 2>&1 | tee make.log

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2539/unable-to-compile-on-ubuntu-2004-or-run