[Bug 1912044] Re: invalid arch-independant ELF magic

[geole0]

Hello
This "legacy only" computer is old. It now contains an SSD disk composed of four partitions including windows 10 and ubuntu 20.04.
Another disk containing windows XP and windows 7.
A third larger disc containing the duplications of the two preceding discs.

I know the ubuntu boots fairly well since I participate in an important way in the EFI part with another computer in the following documentations,
https://doc.ubuntu-fr.org/refind
https://doc.ubuntu-fr.org/tutoriel/installation_sur_disque_usb

I noticed that the installation of ubuntu has changed a lot with version 20.04.
So I want to see how version 21.04 will behave.

So I decided to use this 64-bit computer which only knows the LEGACY mode to install the future version 21.04 on an external hard drive by choosing to overwrite the entire drive.
(I often used the option something else.)
 The installer therefore overwrote the ms-dos partition table to install a GPT partition table.

Everything is going well. The boot is done well with this external
drive. But I get the quoted message which is the subject of my
correction request.

I don't quite know how to understand it. I saw that it was cited a lot
several years ago and that it seemed to be a mix between 32 bit mods and
64 bit mods.

Subsequently I have the following tests:

Boot the ubuntu from the SSD (20.04.1). Make him discover the O.S. Installed. He forgets to look at the contents of the external disks !!!
So I duplicated by gparted the root partition 21.01 in the big disk and restarted the detection. At the next boot, I can choose version 21.04 (the duplication of the external disk in the large 3 TB disk formatted GPT). It works. I even updated it yesterday.

I also plugged the external drive into my laptop which is in efi.
The boot works perfectly well!

It is possible that installing version 20.04 or version 20.10 will give
the same result. I did not try.

Hope this can be of help to you.

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https://bugs.launchpad.net/bugs/1912044

Title:
  invalid arch-independant ELF magic

Status in grub-installer package in Ubuntu:
  New
Status in usb-creator package in Ubuntu:
  Invalid
Status in grub-installer source package in Hirsute:
  New
Status in usb-creator source package in Hirsute:
  Invalid

Bug description:
  Hello
  I decide to install the DAILY version of Hirsute Hippo using a "legacy only" computer.
  I choose to install on the whole disk. As a result:
  The msdos partition table is destroyed and replaced with a GPT partition table.
  A  32 MiB bios_grub partition is created,
  A 512 MiB EFI partition is created
  And another partition with the rest of the available disk space is created.

  But the boot is impossible with this error message
  ERROR: Invalid arch-independent ELF magic
  Entering rescue mode ...

  In this mode, typing the characters "help" "boot" "vmlinux" etc ... gives the response 'unknown command "
  Only the set command responds correctly and shows that the variables are correctly positioned..
  ( boot=(hd0,gpt3)/boot/grub )

  The workaround found to boot the shaggy version is as follows

  1) Boot from another disk and use another ubuntu, make it discover all the O.S. present. (sudo update-grub) then reboot and choose version 21.04 from the list.
  that works properly.

  But this solution does not suit me. But it shows that the problem is
  probably with the contents of the bios_grub partition which I cannot
  read.

  Please quickly improve the grub.

  See also this french discussion : https://forum.ubuntu-
  fr.org/viewtopic.php?id=2060928

  Have a nice week end

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