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2 months agoHappened to me as well, freezing up the whole system, especially with many/large files. None of the suggestions I found online actually worked. Happened on USB drives as well.
Then my whole HD gave up completely. Replaced it and all problems are gone. USB drives as well: turns out Linux at least tries to read it so you can attempt to save some data, while Windows just says it’s unreadable.
Just got the upgrade today. It failed somewhere halfway, made a mess and destroyed grub with no way to restore it.