My impression is that many configurations not commonly used by home users (but used by power users, schools, companies, etc.) are not properly tested in Ubuntu.

My impression is that many configurations not commonly used by home users (but used by power users, schools, companies, etc.) are not properly tested in Ubuntu. In the past we had a lot of problems with pam_unix2, which was the only module at that time which could properly handle NIS passwords and password changes, we ended up recompiling the package as there no reactions to bug reports...