I have two macs, a 2015 Macbook Air and a late 2009 Mini.
The Air boots everything, USB or DVD, so far but not Trisquel. Mint, Ubuntu, Fedora.
Mini boots Trisquel and also Debian and Mint. I haven't tried anything else. These are all from DVD.
I didn't do anything special to boot T8. Alt-option at boot chime or Startup Disk from System Preferences.
