On Sat, 11 Jan 2020 21:03:28 -0000 "Steven Usdansky" usdanskys@gmail.com wrote:
I've got Rawhide, F31, F30, a couple of F29 installs, Manjaro and Ubuntu 19.10 on my external HD (UEFI system). The "trick" is to mount the same efi partition at /boot/efi for all of the installations. All Fedoras share the same /boot/efi/EFI/fedora directory, whereas Manjaro and Ubuntu each get their own directory under /boot/efi/EFI.
So does everything installed under /boot/efi come up in a menu? And does the grub.cfg in /boot/efi/EFI/fedora bring up a menu that lets you select which fedora OS to boot? That seems very straightforward.