Comment 1 for bug 1858088

I updated the kerberos guide for focal at https://discourse.ubuntu.com/t/service-kerberos/11331

I don't explicitly mention the kdc settings in krb5.conf, but during the course of installing the packages, debconf prompts will happen and ask you for your kdc and admin server. If you have them in DNS already, then these questions will be skipped.

If you think a brief explanation of these krb5.conf settings is important, let me know.