FOG 1.2.0 is obsolete now, so is Ubuntu 10. And it’s just a bad idea to use anything but the latest LTS version of Ubuntu for a new build.
Until well ago was the official version, this I say, are LiveCD with FOG 1.2. installed so you only have to install and configure.
Fog 1.3.4 still gives errors, we are testing it, so I think this is a good solution to install without connection.
In any case you can always try …