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I was asked to integrate some new Ubuntu 22 boxes into an existing Kerberos instrastructure. I found several references for installing a kerberos client which all start with:

sudo apt-get install krb5-user

Unfortinately this results in:

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package krb5-user is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'krb5-user' has no installation candidate

I do not have a lot of experience with Ubuntu so maybe this is normal. Is Kerberos not supported on Ubuntu? If it is supported, what do I do to fix this?

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  • Do apt-cache search kerberos, which will produce a list of packages mentioning Kerberos. Commented Feb 13 at 20:43
  • That produces a list of about 37 package but none are krb5-user. Commented Feb 13 at 21:54
  • The Ubuntu package search server sees krb5-user for Ubuntu "jammy" (22.04): packages.ubuntu.com/jammy/krb5-user Are you sure your server has the correct config for the public Ubuntu 22.04 apt repositories? Commented Feb 13 at 22:46
  • No. How do I check? Commented Feb 13 at 22:56
  • 1
    One way to check is to invoke the command sudo apt-get update. This updates the local cache of packages available from the repos that apt uses, which doesn't hurt anything. The output will include lines with URLs like http://security.ubuntu.com/ubuntu. Do the hostnames in those URLs end in ubuntu.com? Another command would be to pick one of those 37 package names listed by your sudo apt-cache search kerberos command and invoke sudo apt policy package-name and see what URL appears in lines under the "Version table:" line. Same question about those URLs - not Ubuntu hostnames? Commented Feb 14 at 6:07

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