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I've installed windows 8 64 bit on uefi . Now I want to install ubuntu 12.10 on uefi too. I used an usb to boot in uefi mode and started install, but in "installation type" screen, it was unable to detect any os. I tried ubuntu without installing it and:
1. In uefi boot mode, I cannot mount any partition.
2. In Legacy boot mode, I can mount all partitions.
Windows 8 OS partition is primary partition.
Thank you in advance!
Sorry for my poor English!

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Is it possible you are working with an encrypted partition? If it is encrypted then Ubuntu won't be able to see what is on the disk –  David Stinnett Jan 26 '13 at 8:14
    
I think my partition is not an encrypted partition. I've never use a tool to encrypt my partition.Furthermore, in legacy mode I can mount all partitions. –  Duong Jan 26 '13 at 10:10
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I have had the same problem. Are you using an SSD? See this guide and the separate post on problems with SSDs here. The comments on those posts might be helpfful as well - it partially depends on the BIOS setup you have.

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