I currently have (Arch) Linux on my MacBook Air (2012), and I want to install High Sierra on an external drive, so I can run the new
eficheck. How do I do that, and without disturbing my existing Linux installation?
In particular I'm worried that the installation would mess up my current booting scheme. It would be fixable, but I don't have time for that kind of problem now. If it would just change the efibootmgr order, I know how to alter that.