SUDO Cannot Resolve Host / gksudo NOT WORKING

Version:
Ubuntu Hardy 8.04

Symptoms:
After upgrading Ubuntu from 7 to 8.04, then when trying to SUDO something, you get the following smptoms.

SUDO in Gnome : gksudo [whatever] don't work

also when trying to sudo in console, I get this message

SUDO in Terminal/console don't know machine localhost
>sudo bash
>sudo: unable to resolve host [computername]

Solution:
1) Backup and then edit edit the /etc/hosts file
cp /etc/hosts /home/somebackupfolder/hosts

2) Edit the line 127.0.0.1 and change the one with the trailing domain on it, [computername].[SOMEDOMAIN]. Remove that [SOMEDOMAIN].

Reasons:
Basically your computer lost it's own localhost identity. Somehow it is related to networking, possibly with Samba. Samba should still work provided you followed the Samba bookmarking mount points here.