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we recently bought a new windows 8 laptop, and we are trying to install Ubuntu to it in a dual boot configuration. I downloaded the 64 bit 12.10 iso and put it in a USB stick, both with the utility recommended from the Ubuntu installation guide and with Unetbootin. However, when I reboot the laptop and select from BIOS the USB as first option, it just flashes the Toshiba logo for 2 seconds and then reboots again and does this ad infinitum (I disabled SecureBoot) until I remove the usb stick and then it boots normally into windows. If I however turn on the option CSM/legacy boot in the BIOS I CAN boot into the usb installer, so I don't think it is an issue with the usb stick nor the iso image.

The question is, how do I get it to boot in UEFI mode? Or should I just keep going in legacy mode and hope the installer recognizes the UEFI boot?

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I have not tried this, which is why this is a comment not an answer, but there is a long discussion here. Try it if it works you can summarize the process as an answer and earn some reputation too. –  Warren Hill Feb 12 '13 at 13:10
    
You could also see if a firmware update is available for your computer. Such updates sometimes fix problems like the one you've described, although that's far from guaranteed to work. –  Rod Smith Feb 13 '13 at 17:25
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In the end I ended up installing it in CSM/Compatibility mode. It didn't boot. But then using the Ubuntu version with BootRepair as a Live USB disk I ran BootRepair and it installed the EFI files and changed the booting mode and it worked. I still have no idea why it didn't work from the beginning.

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