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I have finally discovered the secret to installing #Slackware on my m.2 drive. It was silly... after cfdisk, just type /dev/nvme0n1 and bada bing! Why have I been so silly my whole life? I was just too afraid of wiping my archive HDD by accident...
Nevermind... it's all installed now, but UEFI fracked me. I can't get it to friggin' boot!