Public bug reported:
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.
** Affects: grub-installer (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2126454
Title:
Installing Desktop ARM64 on ARM64 laptop crashes when installing GRUB
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