*** This bug is a duplicate of bug 32906 ***
https://bugs.launchpad.net/bugs/32906
I just had this same problem,
sudo was working fine until I clicked on the icon for "Wired network
connection" and the manual configuration, then I edited the domain.
This had upset sudo. When I reset back the domain (in a similar way)
sudo started to work again.
--
sudo: unable to resolve host HOSTNAME
https://bugs.launchpad.net/bugs/203593
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