I just love how often, when you search for an answer to a question about some Linux thing or other, it'll take you to forums where the questions simply don't get answered
very often because some forum cop has decided the question is irrelevant, or someone asked it ten years ago and so it didn't need to be asked again, or whatever
Linux geeks suck
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btw I finally did get an explanation of my problem, but not a solution.
https://askubuntu.com/questions/409520/unable-to-open-dev-sdb-read-write-read-only-file-system
apparently the USB drive is now fucked, a known problem with SanDisk USB sticks