[Bug 2126454] Re: Installing Desktop ARM64 on ARM64 laptop crashes when installing GRUB

[Tobias Heider]

This sounds like a kernel issue. The Yoga being a Snapdragon might
actually mean it does not support EFI variables.

There is a workaround in the kernel which many other Qualcomm machines
use. I think the device would have to be on this list:
https://github.com/torvalds/linux/blob/master/drivers/firmware/qcom/qcom_scm.c#L1993-L2019

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https://bugs.launchpad.net/bugs/2126454

Title:
  Installing Desktop ARM64 on ARM64 laptop crashes when installing GRUB

Status in grub-installer package in Ubuntu:
  New

Bug description:
  I've attempted to install Ubuntu Desktop 25.10 ARM64 on a Lenovo Yoga C630.
  The live USB disk works fine. I've tried installing it to a second USB disk so I don't overwrite Windows, so there is a chance that it won't happen when installing to the internal SSD, though I'm pretty sure it will due to the nature of the installation.

  The installer proceeds as normal until it reaches the stage of
  installing GRUB, then it fails because "EFI Variables are not
  supported on this system". I'm not sure whether the hardware doesn't
  support EFI variables or it's just because the efivars module is
  missing from the installation media. If I install grub manually using
  the grub-install command, after reboot grub can't find /boot and falls
  into a rescue grub shell. Furthermore, it does not copy the DTB files
  nor the detection script.

  The only way I eventually got it to boot was by manually copying the
  DTB files and the detection script from the live USB's EFI and boot
  directories into the target disk. Since this involves manually editing
  grub.cfg, any updates that involve update-grub are likely to overwrite
  it, resulting in having to edit it again.

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