I am using Debian Stretch with lightdm. Suddenly, I am no longer asked for a password when I log in. As soon as I fill in my username and press tab, the password field is removed and I can log in without ever entering it.
- With a command line login, the situation is the same: I only have to enter my username to log in.
- No password is asked when I use sudo, even across reboots and after
- Some applications, such as the root terminal in Thunar, warn me that due to my 'authentication mechanism setup', I do not need to enter a password.
- My password is no longer accepted by programs which have a graphic prompt for a password, such as
sudo synaptic-pkexecdoes work.
The answers I'm finding are specific to settings in lightdm, or in
/etc/sudoers. However those files look normal, and this problem seems to be more general. Can anyone offer pointers on how to find out what has changed in my system?