When trying to use Cobbler 2.4.1 to install Ubuntu on some older Dell Poweredge 1425s. The strange thing is that the pressed script always drops to manual on the first step of detecting the network card. You can manually select the right one and proceed with the install perfectly. But this is frustrating as it breaks the entire idea of “automation.”
I found the syntax to the answer here: Though its tangential to the questions: http://serverfault.com/questions/143296/how-to-get-http-preseed-to-work-correctly-on-ubuntu-10-04-lts-lucid
Look in the answer for the line
interface=auto. Here is where you need to add a kernel option or parameter to include interface=eth0 and everything will work.