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Puppy Linux UEFI (alternatives?)
(lemmy.world)
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I'm a fan of SystemRescue. It's specifically designed for backing up and fixing disk layouts, and it supports both BIOS and UEFI booting.
I've never tried it on Secure Boot enabled devices (I usually disable secureboot before troubleshooting systems), so I do not know if they use a valid signed efi-stub.
For "simple" stuff, I usually boot a live ubuntu image. If the machine has sufficient RAM, I can get away with installing quite a few packages that I need for troubleshooting (gparted, gdisk, etc.).