People have found out that you can only install macOS and Windows 10 on Apple’s new Macs equipped with the T2 security chip.
By default, Microsoft Windows isn’t even bootable on the new Apple systems until enabling support for Windows via the Boot Camp Assistant macOS software. The Boot Camp Assistant will install the Windows Production CA 2011 certificate that is used to authenticate Microsoft bootloaders. But this doesn’t setup the Microsoft-approved UEFI certificate that allows verification of code by Microsoft partners, including what is used for signing Linux distributions wishing to have UEFI SecureBoot support for Windows PCs.
Right now, there is no way to run Linux on the new Mac hardware. Even if you disable Secure Boot, you can still only install macOS and Windows 10 – not Linux. Luckily, Linux users don’t have to rely on Macs for good hardware anymore – there are tons of Windows laptops out there that offer the same level of quality with better specifications at lower prices that run Linux just fine.