install “legacy” brew on M1 apple silicon

I tried installing homebrew for about 3 days following the completely identical howto postings out there (i.e. “prefix with ‘arch -x86_64′”). Alas, it didn’t work: The other recommendation (run the whole terminal under Rosetta2, scroll down to “Running a special flavorĀ […]”) also did not work. What did finally work though was changing my login shell […]