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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?

Dutch Slav
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    is your efi partition marked as bootable? did you actually install a bootloader to the drive? – Esther Jun 28 '23 at 21:27
  • See https://askubuntu.com/a/1403793/43926 for USB drive that boots both BIOS and UEFI – C.S.Cameron Jun 29 '23 at 03:02
  • You need both /EFI/ubuntu & /EFI/Boot as full install boots from /EFI/Boot/bootx64.efi using drive entry like live installer, but need the 3 line grub.cfg in /EFI/ubuntu to find the full grub in your install. did you update fstab with UUID of external drive's ESP? `lsblk -f` If UUID correct you can just reinstall grub `sudo grub-install` which will use all default parameters. – oldfred Jun 29 '23 at 03:39
  • I moved the `Boot` and `ubuntu` folders into a new `EFI` folder. Now my BIOS detects it's there, but it restarts when I tried to boot. – Dutch Slav Jun 29 '23 at 05:42

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