This sounds very similar to bug 32906, but this was fixed in hardy
(8.04).

I cannot reproduce this at all, if I remove "localhost" and my hostname
from /etc/hosts, both sudo and gksu still work fine.

To debug this on your side: do you also get the hang if you run "sudo"
in a root terminal? I. e. do

  sudo -i
  [ wait until you have a root prompt ]
  sudo id

The second sudo shouldn't ask you for a password, but just print
"uid=0(root) ...". Does it hang? Does it give you any error message? If
it hangs, please do (in that root shell)

  strace -o /tmp/sudo.trace sudo true

and attach /tmp/sudo.trace here.

** Changed in: sudo (Ubuntu)
       Status: New => Incomplete

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sudo hangs when localhost can not be resolved
https://bugs.launchpad.net/bugs/234879
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