root@ub2:~# apt install -y krb5-user libpam-krb5 libpam-ccreds auth-client-config
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package auth-client-config
Course: Kerberos for Beginners: Intro to Network Authentication Protocol - Learn Interactively
Lesson: Playground I - Kerberos for Beginners: Intro to Network Authentication Protocol