Working on a clean install of Ubuntu Desktop 13.04. I changed the hostname of the system /etc/hostname and later noticed I got the following error message “unable to resolve host hostname” when ever I did an sudo command (example: sudo -i).
To resolved this I changed the following:
I used nano to edit /etc/hosts and changed host entry to 127.0.0.1 to my new host name. Closed the file and no more error message.