In particular, distro package config scripts are frequently guilty of trying to create or update users in /etc/passwd and /etc/group, with no mechanism offered to switch them to using LDAP. This tends to leave systems with a split auth setup, where some users and groups are local and some are in the directory. When you want to add a directory user to a local group, this becomes a nightmare.
Please: scrap the file-based auth, and move to LDAP.
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