Re: lmvid not found

[Andrei Borzenkov]

On 26.03.2024 19:05, Eduardo Suarez wrote:
> Hi,
>
> I recently moved my disks to a new computer and I'd like to avoid legacy CSM
> and boot from UEFI. So far I can boot fine with CSM enabled.
>
> My setup is:
> sda -> GPT
> ├─sda1              95,4M  part  /boot/efi
> ├─sda2                 4M  part  BIOS boot partition
> ├─sda3             166,7G  part
> │ ├─vgssd-slash       35G  lvm   /
> │ ├─vgssd-var      116,7G  lvm   /var
> │ └─vgssd-usrlocal    15G  lvm   /usr/local
> ├─sda4                 2G  part  [SWAP]
> └─sda5              54,8G  part  (not important)
> sdb... (data, not important)
>
> I install grub like this
>
> # grub-install --verbose --target=x86_64-efi
>
> with GRUB_PRELOAD_MODULES="lvm ext2 part_gpt", and it creates and 'efi' file in
> a subdirectory in /boot/efi/EFI/ as expected.

GRUB_PRELOAD_MODULES is used by grub-mkconfig, not by grub-install.

> Then I reboot, get into the BIOS setup, select the option to boot, disable CSM
> and try to boot from the grub efi image.
>
> However, what I get is:
>
> error: disk `lvmid/yc9Fs5-...(long string)...-rF8WbQ' not found.
> Entering rescue mode...
> grub rescue>
>
> The lvmid tag refers to the root partition (vgssd-slash). From there I have a
> reduced shell where I only see (hd0) and (hd1) with no partitions.

The obvious first possible reason - generated grub image does not embed 
part_gpt (or whatever partition scheme is used), so grub does not detect 
partitions. Which is rather strange, because grub-install should 
auto-detect it.

> I have tried different options like trying to set up a device.map file or
> adding the 'lvm' module like this:
>
> grub-install --verbose --target=x86_64-efi --modules="part_gpt part_msdos lvm"
>
> and the error turns into:
>
> Unknown command 'search.fs_uuid'.
> error: unknown filesystem.
> Entering rescue mode...
> grub rescue>
>
> However, I can't see any 'search.fs_uuid' in the grub.cfg file. Adding the

How is the content of grub.cfg relevant at this point?

> 'search_fs_uuid' module does not solve it.

You do not show the error in this case so it is entirely unclear and 
useless. But to search for UUID grub image must include the correct 
filesystem driver (you did not show filesystem type).

> Any ideas on how to fix this?

No. But showing the full output of your command(s) may give some hint. 
Start with the very first one

grub-install --verbose --target=x86_64-efi