I just reinstalled OpenMediaVault on my Optiplex 3020 since I have used it with Ubuntu for a while.
Now after installation it can't find any bootable media.
UEFI is enabled
Secureboot is disabled
I forced the set up in UEFI mode since it was detecting an OS installed in legacy mode.
All drives have been wiped and re initialized in GPT, so I'm guessing its counting my USB that I created with Rufus 3.8 and formatted in MBR, as always.
Grub exists on the system SSD in the first fat32 partition, in "EFI/debian/grubx64.efi"
followed by the Ext4 partition and a swap partition.
I tried to add "EFI/debian/grubx64.efi" as a boot option in the bios, but it doesn't stick after applying and rebooting and goes back to "no bootable devices found"