Had same issue after upgrading from Gutsy to Hardy Heron
$ sudo
sudo: unable to resolve host bronwie <-(this is my pc name on my network)

Looked in /etc/hosts and entry

127.0.1.1 brownie.mshome <-- this was the entry generated by the upgrade

I updated the entry to 127.0.1.1 brownie as per instructions on
http://ubuntuforums.org/showthread.php?p=4508774

Sudo now working correctly.

However if I open network manager & add in mshome as my domain (local
windows pcs etc.) the host file gets the entry updates again and stops
the terminal recognising sudo.

I am using Ubuntu 8.04 upgraded from Gutsy.

-- 
konsol sudo can't resolve host
https://bugs.launchpad.net/bugs/204824
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