Re: grub works, but boot menu is gone and has an error message. [corrected]

[josep lladonosa capell]

Hello, John,

My guess is that some part of the EFI setup is missing.

I found a nice explanation but it is Fedora based:

https://www.dedoimedo.com/computers/grub2-fedora-command-not-found.html

In the solution part, as you are using Ubuntu, replace "dnf" with "sudo
apt" and "<os>" with "ubuntu" so the commands would be:

sudo apt install grub2-efi-modules
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-mkconfig -o /boot/efi/EFI/ubuntu/grub.cfg

This is just my guess.
Regards,
Josep


Missatge de John Griessen <john@industromatic.com> del dia dl., 21 de febr.
2022 a les 22:18:

>
> I've had this symptom for a while and cannot find much by searching for
> the error message.
>
> During boot, when the grub menu usually would come up, I see
>
> error: can't find command 'exec' .
> loading 5.11.0-46-lowlatency
> loading initramfs
>
>
> I think I got this when updating and deleting and reinstalling low level
> ubuntu parts like busybox, syslinux, bash.
>
> Any ideas what could be missing on my ubuntu 20.04 distro?
> Ordinary running of grub-install /dev/sda  says good and doesn't change
> the symptom.
>
> ll /sys/firmware/efi
> ls: cannot access '/sys/firmware/efi': No such file or directory
>
>
> sudo gdisk -l /dev/sda
> [sudo] password for john:
> GPT fdisk (gdisk) version 1.0.5
>
> Partition table scan:
>    MBR: MBR only
>    BSD: not present
>    APM: not present
>    GPT: not present
>
>
> ***************************************************************
> Found invalid GPT and valid MBR; converting MBR to GPT format
> in memory.
> ***************************************************************
>
> Disk /dev/sda: 500118192 sectors, 238.5 GiB
> Model: INTEL SSDSCKKF25
> Sector size (logical/physical): 512/512 bytes
> Disk identifier (GUID): 2178828C-D2B9-4B38-BA80-294C83D53164
> Partition table holds up to 128 entries
> Main partition table begins at sector 2 and ends at sector 33
> First usable sector is 34, last usable sector is 500118158
> Partitions will be aligned on 2048-sector boundaries
> Total free space is 19053 sectors (9.3 MiB)
>
> Number  Start (sector)    End (sector)  Size       Code  Name
>     1            2048         1050623   512.0 MiB   0700  Microsoft basic
> data
>     5         1052672       475541503   226.3 GiB   8300  Linux filesystem
>     6       475543552       500105215   11.7 GiB    8200  Linux swap
>
>
> Thanks,
> --
> John
>
>