This tutorial covers gradual guide to setup a Kerberos Server (KDC) and Kerberos Enabled Client, then testing the setup by obtaining a Kerberos Ticket from the KDC server.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-kerberos-kdc-server-and-client-on-ubuntu-18-04
Hi.
First. Thank you for this concise but complete mini tutorial.
(FYI: I had no kerberos installs on my fairly fresh install of ubuntu, this tutorial is my first “dip” 
)
Second, when I try to run:
sudo apt install krb5-user
I get this
krb5-user is already the newest version
Which is an obvious issue.
However, I do not know how to (re) configure the client side to point to three things mentioned in the article:
Again it will ask 3 thing one by one like KDC Server setup.
Kerberos Realm – UBUNTUBOX dot COM
Hostname for the KDC Server – kdc dot ubuntubox dot com
Hostname of Admin server – kdc dot ubuntubox dot com
I cannot find a krb5-user “reconfigure” command.
Thank you.
For other readers, I had to use this command to list principals.
sudo kadmin.local -q “list_principals”