Most or all of the AskUbuntu posts on this subject seem to wind up talking about either USB keys or CD's. I know Ubuntu 14.10 doesn't fit on a CD, and I don't have a USB drive.
I'm running Windows 8.1 on a Dell "Inspiron" laptop. Firmware is UEFI, SecureBoot is turned off. I have set the "Priorities" on the Setup screen to #1=UEFI OS, 2=Windows Boot Manager. I don't really know what that means. I haven't found the "Boot Order" selection I used to see with BIOS.
I have downloaded "ubuntu-14.10-desktop-amd64.iso"
Right-clicking on the ISO and selecting "Send to DVD RW Drive" is no good -- the disk contains only one file, the ISO itself.
I opened the ISO using "Mount as Virtual Drive" and tried to copy the files in it onto the DVD drive. Seemed to burn alright, but when I boot the firmware powers up the DVD but seems to simply ignore it.
Reading about UEFI, it seems to require a FAT-type format on the boot device. I have not been able to find any way to "format" a DVD as FAT. The Windows "Format a DVD" dialog has a "Format Options => Create an MS-DOS startup disk" section, but it is always greyed out.
How can I make the DVD so that UEFI firmware "likes" it, and are there other options on the Setup panel (or elsewhere) I should look at?