Failure of dual booting Ubuntu with Windows 8 on the Satellite P845t

I tried in vain to dual boot Ubuntu 13.10 to a new Satellite from Toshiba with Windows 8.1. The laptop has UEFI. I used the two live DVD and live USB, and I tried with SecureBoot both active and disabled.

Whenever I have the same failure. J
UST before the next GRUB, the error message screen appears flashes briefly on the screen "error: variable 'root' is not defined". The GRUB screen appears. I tried Trying-out Installation and Installation and whenever once I have selected one of these options, then, the screen turns off and remains empty. When you use a DVD, the DVD still Purring for several seconds, before going to death.

Out of curiosity I tried to install OpenSUSE 12.3 in the same way (with SecureBoot both enabled and disabled in turn, etc.) and stalls from installation to a similar point every time, which leads me to think that it is something to do with how UEFI is installed on the laptop.

The laptop is a Toshiba Satellite P845T about 3 months with the HARD drive replaced with a SSD.
It came with pre-installed Windows 8, and I've upgraded to 8.1 Windows last week, shortly before trying to install Ubuntu.

Curiously, the Windows desktop 8.1 has a watermark in the bottom right that says: "SecureBoot is not configured correctly", but that may not be not relevant for this query, such as Google search, that suggests that many people have this watermark even if SecureBoot is properly configured. And activating/deactivating the SecureBoot makes no difference for the message.

Any help would be welcome, as I'd like to get this double-started with Ubuntu.

Thank you!

Hello

Can you tell me if you tried to start a direct media from a USB?
If YES - which was / is the result?

BTW - I guess that's your feed:

http://UbuntuForums.org/showthread.php?t=2184839

BR

Tom

Post edited by: MannerhagenVPO

Tags: Toshiba

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