PS--for anyone still reading:
search-enginedbash: sudo: command not foundand did about 15 minutes of reading last night. It's a common error, It happens when privileged and unprivileged paths diverge. Or something like that. It something that;s easy to fix except I don't think anything's broke as no privileged command I've done since this has got this message.
my theory is still that computers have brain farts and mine appeared to.