User & Account Management

Manage users and permissions.

Remove or lock unused accounts:

sudo deluser username
sudo passwd -l username

Enforce strong passwords via PAM:

sudo apt install libpam-pwquality
sudo vim /etc/pam.d/common-password
# add: password requisite pam_pwquality.so retry=3 minlen=12 difok=3

Account expiration:

sudo chage -M 90 username
sudo chage -I 30 username