If I take a snapshot from my root filesystem (so an identical copy), mount it, chroot into it, and try to upgrade it using do-release-upgrade, the process fails. I have seen for example it's complaining about /boot/efi not being mounted, but of course I don't want it to mess with that (yet).
Any ideas? I am thinking about this to stage upgrades at home for remote family members, could save me a lot of time when a new LTS comes along.
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