I ran across articles that point to the fact that Apple (with new hardware) is making it difficult to boot into Linux. This would seem to be a perpetuation of Microsoft and Apple attempting to "
elbow" Linux aside. Whether true or not, I do not know.
My viewpoint is simply a reflection of reading passing headlines. I don't know whether Microsoft and Apple are actually attempting to frustrate the adoption of Linux as a mainstream operating system. If they weren't; my guess would be that both Microsoft and Apple would have been working with the Linux community to have a (universal) secure boot option that would work with virtually all operating systems.
Booting Linux Is Impossible On New Apple Hardware
Don’t Panic, You Can Boot Linux on Apple’s New Devices
Apple’s T2 Security Chip Is Currently Blocking Linux From Booting