I installed Ubuntu 22.04 LTS on my external SSD. I needed to create the partitions myself. Now, after copying *.efi from my GRUB installation, it still won't boot. I tried directly booting from bootx64.efi and grubx64.efi, to no avail. Windows advanced reboot also doesn't recognize it, as well as my UEFI/BIOS startup menu. Anyone know how to fix?
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