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Then on first boot I get this blie screen reminiscent of BSOD with some tiny text on it asking me about something named MOK. No info whatsoever. I search online and people say it's about secure boot and I should disable it. So when the pc suddenly restarts for no apparent reason I go into bios to turn off SB, but it's already turned off!

Rebooting gets me back to the blue screen, but now the option I chose last time is not there anymore, and I select continue boot, and it boots up.