TO Updater failed / Luci not accesible

I see now about the schnapps issue, it might be related to schnapps experiencing trouble when trying to export

but I cannot be sure, neither whether this may not happen with more contemporary versions of the OS. Unfortunately schnapps does not offer to exclude certain paths [1]

There is no easy debug option for schnapps and it would require other tools, e.g. strace, to take a closer look.

Alternatively, since medkit being just a compressed archive, it should be possible to generate one with common archiving tools such as tar.

[1] [RFC] export/import includes directories from partitions other/foreign than /dev/root (#9) · Issues · Turris / schnapps · GitLab