I can confirm this bug in Hardy-Gnome. If a domain is added to the
hostname in /etc/hosts, sudo does not work any more. In Gutsy that did
not matter; sudo still worked even if a domain name was added:

172.0.0.1 localhost [hostname].[domain]

I think, the problem is not, how the domain name has been added. It is
rather how /etc/hosts is parsed.

A simple workaround to edit /etc/hosts without rebooting in recovery
mode (as described above) is to open an administration terminal from the
main menue. This is possible without any sudo command and does still
work.

-- 
[hardy] Manually Configuring Network Causes Massive, Unreversable, Failure
https://bugs.launchpad.net/bugs/185209
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