This is evolving to a subject better discussed at the forums by the way,
as this seems to be a misconfiguration in the "stacklet".

The hostname is kept by the kernel in /proc/sys/kernel/hostname. In your
case, it is "ubuntu".

What hostname -f does, is the equivalent of running

getent hosts `hostname` | awk '{print $2}'

on the command line. If that command doesn't work, "hostname -f" won't
work either.

Please attach your /etc/resolv.conf, /etc/nsswitch.conf and /etc/hosts
so I can see what's wrong with the NSS resolver on your system.

Cheers,
Antonio

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