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I have a Ubuntu 13.10 CD.

When I try to boot using UEFI it won't boot (with or without Secure Boot), even if I change my boot priority.

It does boot when using Legacy BIOS mode.

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Are you getting any errors? Or do you only get a black screen? – Louis Matthijssen May 6 '14 at 14:35
You could try using legacy bios mode. Even if the CD is BIOS booted, the installer should still do an EFI install if it detects an EFI system (eg. the amd64+mac images do not support EFI booting, but still install an EFI system). – bain May 6 '14 at 15:10
The installer installs in whatever boot mode was used to boot it. In other words, if you install in EFI mode, you get an EFI-mode installation; and if you install in BIOS mode, you get a BIOS-mode installation. Macs can switch boot modes relatively painlessly thanks to Boot Camp and third-party tools like rEFIt and rEFInd (the latter of which I maintain). You can also install an EFI-mode boot loader after the fact, on both PCs and Macs. – Rod Smith May 8 '14 at 12:51
Please describe what you mean by "won't boot." What are the precise symptoms you see? For instance, is there an error message? Do you see a GRUB screen appear with options to try or install Ubuntu? Do you see a disk activity light and then nothing, or nothing at all from the moment you select the medium? What type of medium are you using (USB flash drive, CD-R, or something else)? What brand and model computer are you using? – Rod Smith May 8 '14 at 12:53

Are you using the 64bit version? Have you turned off fast boot in bios? Also, ubuntu is out with newer version 14.04 LTS

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