1. Just to rule it out, have you checked that the burn is good (
Re: Checking the integrity of a LiveDVD/CD)?
2. What is your hardware? CPU? GPU?
3. If you can, run the following commands in Ubuntu and post the results here as they will give more details about your hardware:
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sudo lspci
sudo lsusb
sudo lsmod
4. Have a look in /boot/grub/grub.cfg (or wherever your GRUB 2 config file is located) to see what kernel boot parameters Ubuntu is using, and post the kernel boot line here.
5. Boot the Live DVD and press F5 when the menu appears. A small pop-up menu with a few kernel boot parameters will appear. The arrow keys move up and down the list, and pressing the Space bar or Enter selects a parameter. More than one enty can be selected this way. This is a new feature I haven't seen before and it confuses me, so I just press Esc and type the kernel boot parameters at the end of the kernel boot line displayed on the screen. Try one or more kernel boot parameters (
Boot parameters and workarounds for problematic Hardware). With problematic hardware, I try parameters such as acpi=off, or noapic, or nomodeset, or xdriver=vesa|ati|radeon|nvidia|nv|nouveau (obviously select one that suits your GPU). But first you need to perform the other steps mentioned above.