[Ernestas V.] > Perhaps hard/symlinking original /etc/passwd, /etc/shadow and > /etc/group to chrooted environments would help? Symlinks won't work. Think about what a chroot environment *is*. Hardlinks will only work if the programs that edit /etc/passwd and /etc/group overwrite them rather than copy / unlink. Bind mounts will work (mount --bind /etc/passwd /mnt/sarge-chroot/etc/passwd) but apparently don't support locking all of a file's representations, so you would need to be careful not to run adduser in multiple chroots at once (like doing several dist-upgrades in parallel, or having users log in to different chroots and all try to change their passwords at once).
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