Yesterday I was finally able to install ubuntu 12.04.3 (64 bits) on my pre-installed Windows 8 (64 bits) Lenovo Ideapad Z500 (if that is of any help). I'll just explain the problem that I have now and if you need more info just ask me (such as the steps I followed to install Ubuntu, etc.) So I boot the computer (UEFI Bios, SecureBoot Disabled, Fast startup on Windows 8 disabled) and GRUB appears correctly (I already ran BootRepair to achieve this), then if I choose Ubuntu, it loads correctly. The problem is when I choose Windows 8 I receive this error:
unknow command `drivemap' invalid EFI file path
Furthermore, in GRUB I see 2 Ubuntu Boot options alongside many windows options and I just discovered that clicking one: "Windows Boot UEFI Recovery" actually boots my Windows 8 as usual. So, I actually have a working dual boot, but instead of choosing "Windows 8 (loader)" which doesn't boot Windows 8 (and just shows the drivemap error) I have to select the mentioned "Windows Boot UEFI Recovery" option to correctly boot windows 8. Is there any way to solve this issue?? Thanks in advance!!
P.S.: The BootInfo generated by BootRepair can be found here http://paste.ubuntu.com/6294680