I'm using Lubuntu 12.04.
I was trying to change my computer name to "main" and I messed up, I'm not sure what to do now.
I was following the directions on this page.
Here's what I did:
sudo leafpad /etc/hostname
I changed the name, then stupidly closed the file, before changing "/etc/hosts"
Now when I try to move on to the next step (sudo leafpad /etc/hosts), or try any command that begins with "sudo" I get this error:
sudo: unable to resolve host main No protocol specified No protocol specified
I can see that the problem is that I've changed the hostname, so the computer's bewildered by my efforts to use sudo because now hostname and hosts don't match. All I need to do is change the name in hosts, but of course I can't do that without sudo.