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neiko
24th October 2017, 08:02 AM
I need to rescue an unbootable UEFI Fedora 26 system.

I have booted from the DVD, and used the rescue choot environment. I have a GPT disk with a small FAT32 ESP partition of type EF00.

I've run:

dnf reinstall grub2-efi grub2-efi-modules shim
grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

as described here: https://fedoraproject.org/wiki/GRUB_2

The grub.cfg file looks plausible. The system boot menu shows a "Fedora" entry, but it is not actually bootable.

What else do I need to do?

boycottsystemd
24th October 2017, 12:31 PM
I'm just guessing but I would try reinstall kernel or install another version.

Did you try to boot rescue kernel ?

dswaner
24th October 2017, 02:21 PM
What shows on the screen when you try to boot?

Have you done searches re your specific hardware?

Any BIOS settings look suspicious?

AlexTheoto
25th October 2017, 07:08 PM
Silly question: Did you mount the /boot on the right partition?
How did your system broke? Is there a hdd problem?