Re: Triple boot Debian 12, Debian 13, openSUSE EFI
Richmond composed on 2025-09-17 18:14 (UTC+0100):
> This is using GPT partition layout and UEFI boot.
> I had Debian 12 and Opensuse dual booting, with Debian 12 having its own
> Grub, and opensuse having its own grub, so I could choose which system
> from the UEFI ? firmware settings on grub.
...
Regardless how you resolve this and settle on a routine, if openSUSE was a default
installation, BTRFS was used as its filesystem for /, included /home/ on a
subvolume on that filesystem, and incorporated snapshotting. Even if you deviated
from default and did some customizing, you still may have BTRFS and snapshotting.
If so, you'll want to ensure that booting from openSUSE's boot menu consistently
remains a viable option for when snapshots need to be utilized. Note too that not
so long ago, Tumbleweed and Slowroll installations began defaulting to no longer
boot using regular Grub2 EFI, but either Grub2 EFI-BLS, or systemd-boot. Which I
don't recall, as I haven't installed either since that switch, and neither tried
either of the two newer booting options. Given the April 2024 timestamp on your
openSUSE ESP, I think you'll have traditional Grub2 EFI in use for it. At least
one of the two newer bootloaders results in kernels and initrds being installed on
an ESP that should be larger than traditionally recommended, and dubiously suited
for sharing with other installations.
--
Evolution as taught in public schools is, like religion,
based on faith, not based on science.
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata
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