I'm still having this issue on Karmic, always I run a command as super
user:
sudo: unable to resolve host (my host)
The system seen unable to resolve my host even if my /etc/hosts seems
OK.
** Changed in: sudo (Ubuntu)
Status: Fix Released => Confirmed
** Attachment added: "My /etc/hosts"
http://launchpadlibrarian.net/37410684/hosts
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sudo fails if it cannot resolve the local hostname and no MTA is installed
https://bugs.launchpad.net/bugs/32906
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