Apple's New T2 Security Chip Blocks Linux from Booting
phoronix.com
phoronix.com
It seems to have been flagged on the assumption that this is easily solved by setting some options in bootcamp. However all reports so far hint at this not being the case.
So as far as I can tell, the story is that modern Macbooks cannot be used for Linux, and that should definitely go on the front-page.