Ah, the reason for me was that /etc/shadow was not in group shadow any more, due to a bug in my backup/restore scripts. What is
ls -l /etc/shadow
for you? If it is owned by root/root, you need to fix it again with
sudo chgrp shadow /etc/shadow
Ah, the reason for me was that /etc/shadow was not in group shadow any more, due to a bug in my backup/restore scripts. What is
ls -l /etc/shadow
for you? If it is owned by root/root, you need to fix it again with
sudo chgrp shadow /etc/shadow