Ubuntu 12.04 dual-boot problem with windows 8

Hi,

I'm trying to boot Ubuntu from my fresh installation on a HP Envy dv7 along side windows 8. I have followed the standard instruction for installation, I have disabled Secure Boot from Bios, and I have repaired the boot sector using boot repair as show here:
https://help.ubuntu.com/community/Boot-Repair
Here is the result given by boot repair, with no error:
http://paste.ubuntu.com/5982404/
Unfortunately when I reboot the machine I just get the standard windows 8 and no boot loader is shown.
Any help would be really appreciated. Thanks.