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So I've downloaded the 64-bit Ubuntu image, burnt it to disk and disabled secure boot via the UEFI setup menu...

But when I run the installation on my Sony VAIO Tap 21, Ubuntu setup tells me that no operating system (in my case, Microsoft Windows 8.1, upgraded from the factory-installed Microsoft Windows 8) is installed!

How can I get Ubuntu 13.10 to detect Windows 8.1, so that I can dual-boot with both Ubuntu and Windows 8.1?

By the way - I am fairly competent with computers... But partitioning is definitely not my strong point, so please keep this in mind when suggesting a solution.

Gregory Opera
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You need to use the "Something Else" option to manually partition your disk. This is described in this question and answers, although it refers to Windows 7 and has some BIOS (vs. EFI) reference/biases. You may also want to consult my page on EFI-mode Linux installations and the Ubuntu community UEFI documentation. Both of those pages will provide you with background that will help you install your system.

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Rod Smith
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