I recently got ubuntu 12.10 installed on my new uefi toshiba ultrabook along side windows 8. I followed these instructions to get the installation working (had to get around intel SRT):
Everything went okay with the installation but I could no longer boot into windows so i ran boot-repair (using the recommended repair). This seemed to work for a hot second. I rebooted and grub loaded correctly so i booted up windows to test. Everything worked, windows loaded, so i restarted again and went to boot ubuntu but after selecting ubuntu in grub it just hung. I had to force turn off my laptop. Then when i restarted, grub no longer came up and it loaded the trouble shooting page for windows. (ubuntu and windows now fail to load).
What makes matters worse is that my usb boot disk of 12.10 will no longer boot either. So i can't even get back into to boot repair. I also don't have a CD drive so I can't burn the boot repair disk.
Please help! my brand new laptop is essentially an $800 paperweight right now.
here is the output of the boot repair job: http://paste.ubuntu.com/1402939/