I'm sorry, I think I jumped the gun on this one. Do check if you nave universe enabled as mentioned previously, but also check if you have security and updates.
The available libkrb5-3 and krb5-user packages in bionic are: libkrb5-3 | 1.16-2build1 | bionic libkrb5-3 | 1.16-2ubuntu0.1 | bionic-security libkrb5-3 | 1.16-2ubuntu0.1 | bionic-updates krb5-user | 1.16-2build1 | bionic/universe krb5-user | 1.16-2ubuntu0.1 | bionic-security/universe krb5-user | 1.16-2ubuntu0.1 | bionic-updates/universe -- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to krb5 in Ubuntu. https://bugs.launchpad.net/bugs/1840905 Title: krb5-user seems not installing on Bionic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/krb5/+bug/1840905/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs