I was actually able to reproduce the issue of Network Manger putting a bad 
/etc/hosts using Fedora with the following steps:
     - remove hostname set from /etc/sysconfig/network
     - remove  all contents of  /etc/hosts
     - reboot
     - Network manager puts invalid /etc/hosts

So to get into this situation isn't easy. Though if you are installing
from a preseed file may actually have this case for Ubuntu.

I also submitted fixes for the invalid file upstream. Though following
these steps on Ubuntu doesn't seem to lead to the results that where
hit. Will have to try again.


** Attachment added: "hosts_fallback_fix.diff"
   http://launchpadlibrarian.net/37705596/hosts_fallback_fix.diff

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oem-config incorrectly setting up /etc/hosts
https://bugs.launchpad.net/bugs/471498
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