3 years later I’m trying to do the same thing and getting the same problem. It’s not clear how the wiki page would help with this problem (with the exception of tweaks to reduce writes).
Install live USB boots. The antergos installer appeared to work fine. But the resulting install on a 2nd USB wont boot. The device wont even find grub.
In my case I’m trying to boot an HP14 Chromebook (falco) with the mrchromebox modified firmware installed (Tianocore UEFI). It currently has GalliumOS (ubuntu derivative for chromebooks) installed on its tiny 16gb hard drive.
Is the link to the wiki basically saying ‘forget the antergos installer and just do a manual arch install’?
It really just seems something is wrong with the bootloader as set up by the antergos installer…