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It is still possible to disable secure boot using csrutil. Apple has never officially supported booting Linux on a Mac.

https://twitter.com/never_released/status/127585087215369011...

See also https://developer.apple.com/videos/play/wwdc2020/10686/ 19:00

If you read the replies, that only loosens secure boot enough to allow downgrading to older Apple-signed versions of their OS. It doesn't let you run unsigned code.

If you only use the GUI then yes, but csrutil allows you to disable it even further.

https://twitter.com/rosyna/status/1275855786984513538

Reply on news.ycombinator.com