Re: Stuck at grub prompt after reordering partitions

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Am 20.04.24 um 23:16 schrieb George N. White III:
I assume you can still boot with manual grub commands.
Yes, linux ..., initrd ..., boot
or: >configfile (hd0,1)/grub2/grub.cfg
which immediately brings back the grub menu.

Retrace your steps and double check UUID's, other typos, and
misplaced quotes.

Recheck /etc/fstab and /etc/default/grub.   You can also check
for errors in the /etc/grub.d/10_linux section of /boot/grub2/grub.cfg.

The only configuration file that I had edited manually was /etc/fstab,
all the other ones were created/altered by commands to update grub. As
far as I remember, the system simply wouldn't boot if there were a typo
in fstab.
As described earlier, I always ended up at the grub prompt.

What I found: If I write the "real" grub.conf directly to the efi
partition (*|grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg), then I
boot to the grub menu as desired (I have read in the fedora wiki that I
should refrain from this ...).
If I reinstall the grub rpms (|*dnf reinstall shim-* grub2-efi-*
grub2-common), then a small grub.cfg is written to the efi partition,
which simply should point to the location of grub.cfg in /boot/grub2/ -
but it doesn't. So the errors seems to be in this file
/boot/efi/EFI/fedora/grub.cfg:

   search --no-floppy --root-dev-only --fs-uuid --set=dev
   206c0b5f-eddf-42e8-96f1-e666c5635cd0
   set prefix=($dev)/grub2
   export $prefix
   configfile $prefix/grub.cfg

But here I am stuck. The UUID above definitely points to the boot partition:
[root@localhost ~]# blkid|grep 206c0b5f-eddf-42e8-96f1-e666c5635cd0
/dev/sda1: LABEL="Boot" UUID="206c0b5f-eddf-42e8-96f1-e666c5635cd0"
BLOCK_SIZE="1024" TYPE="ext4" PARTUUID="2924c08b
-e043-4e4c-94e8-317dfab8b84e"

So, writing the actual grub.cfg to the efi partition as mentioned above
might be a workaround, but I don't know if this will survive an update
of the grub binaries.








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