So I have done this before and I have Ubuntu and Fedora on separate computers but for whatever reason I can't get Ubuntu server to boot from a DVD. I downloaded both 12.10 and 12.04 LTS versions and burned them to a DVD disc. I choose from the boot menu to boot from the DVD drive and nothing happens. It just boots the hard drive.
I checked my DVD with Ubuntu 11 on it and I noticed that it had an application file inside of it in the root directory of the ISO file. Its called Wubi.exe. Is this supposed to be in the Ubuntu Server ISO image as well?
It turned out to be an issue with the DVD I had but I will at least go through the steps that I did before burning a new copy of Ubuntu 12.10.
I checked the Disc on Windows and inspected it. The files all looked like they were there and I can go into it just fine (So I didn't think it was the DVD at this point)
I was also trying to boot it from a PC that already has Ubuntu 11.10 Desktop installed on it so I felt like the specs were fine.
I tried booting from another PC in my house. This one had Fedora 17 on it. Still the same thing happened as before. I would select the disk drive as the primary boot in the BIOS and it would just boot normally skipping the DVD boot.
I basically tried another burn and tried it again on the Fedora PC and it worked. So I then tried it on the PC I wanted to install it on and it worked there too.
So from the steps that I took I think it was just an issue with how it was burned in the first place. I inspected both DVD's and they both show the same files inside them. They both have a boot folder. I also burnt them from the same iso file too. So it must have been the disk it was on.