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I recently bought a Toshiba Satellite P50, I tried installing Ubuntu 12.04.3 and 13.10 alongside Windows 8.1.

If I disable Secure Boot, but leave the UEFI mode on, I can get to the screen that asks If I want to try Ubuntu. When I select that option the screen just goes black and nothing happens.

I'm only able to load Ubuntu from a usb when the Secure Boot and the UEFI mode are both enabled. But, after I install it, the computer loads only into Windows. I ran the boot-repair after from the usb, after disabling Secure Boot, and it told me that I should disable Secure Boot, but when I did I was again unable to load it from the usb.

Thanks for taking the time to read this. Any help or suggestions with would be greatly appreciated!!

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marked as duplicate by Thomas Ward, Eric Carvalho, Braiam, karel, Seth Dec 18 '13 at 21:40

This question was marked as an exact duplicate of an existing question.

    
Several suggestions here. Seems to be an issue with NIC but then you will only have wifi. Toshiba Satellite P50 model number: P50-A-01E Haswell processor ubuntuforums.org/showthread.php?t=2163854 – oldfred Dec 18 '13 at 5:30

If you did your install while secure boot was enabled, need to run boot-repair while secure-boot is enabled.

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Thanks for the quick response. If do that, will it set up the GRUB bootloader with secure boot? My concern with running the boot-repair on secure boot was not being able to get back into windows after. – user226538 Dec 18 '13 at 3:47
    
It will likely auto-detect windows and add a boot option form the Grub2 menu (I'm not sure I never set up windows). If not, no worries as Ubuntu's UFEI won't overwrite Windows UFEI informaton, so you'll still be able to select the UFEI Windows loader. – virtualxtc Dec 18 '13 at 3:51

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