Need help setting up kerberos

I've recently installed Ubuntu as a workstation client and am in the process of getting it to do authentication. One of my first step (according to https://help.ubuntu.com/community/Samba/Kerberos) is to install kerberos. I have downloaded and installed `apt-get install heimdal-clients`. Step one says:

1. Launch the kadmin utility as the realm administrator or as a user authorized to add principals:

$ kadmin -p admin/admin

I'm new to kerberos and am stuck already. What are "admin/admin"? The link assumes one already knows this. According to other webdocs, "The format of a typical Kerberos V5 principal is primary/instance@REALM." How does this correlate with the kadmin example given?
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jmarkfoleyAsked:
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gheistCommented:
You dont need to explicitly set up kerberos, samba winbindd will generate temporary kerberos configuration in absence of kerberos , that will hndle kerberos tickets the way it needs them.

the admin/admin@domain is domain admin. like username@dom.example.com
probably you need to use "net ads join" instead.
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jmarkfoleyAuthor Commented:
Yes, you are correct. I eventually figured this out. Thanks
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