It seems that Ubuntu 12.04 has replaced NFSv3 with NFSv4 and the Ubuntu server guide isn't updated. Following the instructions at https://wiki.archlinux.org/index.php/NFSv4 I was able to configure it correctly.
It seems that Ubuntu 12.04 has replaced NFSv3 with NFSv4 and the Ubuntu server guide isn't updated. Following the instructions at https:/ /wiki.archlinux .org/index. php/NFSv4 I was able to configure it correctly.