This is a response to this mailing list thread: [qubes-users] Error upgrading Debian 11 to 12 (usrmerge)
Is this an unresolved problem? I’m running into this too. Similar problems found online, but this exact version seem to be qubes specific?
I solved this by switching to VM’s own kernel, thus dom0 wouldn’t create /lib/modules mount point, installing usrmerge, then switching back to default (dom0-provided) kernel.
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