If you keep entering the same command with sudo, after a few times of
sudo: unable to lookup $HOSTNAME via gethostbyname() system asks for the
password and you can execute the command. I had to edit /etc/hosts
/etc/hostname and run /etc/init.d/hostname start to have my sudo working
correctly (and my hostname changed)
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Changing hostname using hostname breaks sudo
https://bugs.launchpad.net/bugs/113778
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