After setting up Ubuntu on a separate USB stick, the Grub boot loader was removed.
After setting up Ubuntu on a separate USB stick, the Grub boot loader was removed.
I was attempting to transfer Ubuntu 22.04 LTS to a flash drive for portability, but encountered issues. I avoided VirtualBox due to kernel errors and limited storage, so I used a thumb drive and an SD card instead. After that, I kept my Windows 11 and Fedora partitions intact. Now I need to restore the Grub menu and make the SD card function as a portable Ubuntu installation rather than a live environment.
Assume you're working with a GPT formatted drive using EFI. You might already have checked your BIOS for a missing boot entry, as this is uncommon on EFI systems where GRUB can be overwritten during another installation. Typically, the OS installer alters the boot sequence, so adjusting the order and deleting the new GRUB entry via efibootmgr is usually sufficient. If you're connecting via an SD card reader that mimics a standard flash drive (mass-storage device), it should function properly once Ubuntu is installed, as you likely have done before. GPT partitioning with its own EFI system partition is the preferred method. However, if using a standard SD card reader that registers as such and creates a "/dev/mmcblk" device, be cautious—many systems don’t support booting from an SD card, so consult your manual or BIOS for confirmation.