I have connected my HackRF to my computer that runs Ubuntu and it was working fine until now. It gives me an error:
FATAL:Failed to open HackRF device(-5) HACKRF_ERROR_NOT_FOUND
Has anyone had the same experience?
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Your problem seems to involve USB permissions under Ubuntu, so perhaps your question would have been better-suited for askubuntu.com. But you probably didn't know that when you asked, so we shouldn't really hold that one against you ;)
Anyway, your question seems to be the first one in the HackRF FAQ. If the advice there were short I would repeat it here, but it isn't, so I won't. Good luck, I hope their advice helps you solve your problem!