I have installed Ubuntu on my lenovo ideapad Y580 ( with win 8)
Ubuntu works great, but when I use grub to select windows ,
error can't find commend 'drivemap' invaild EFI file path
what does it mean? how do I fix this and use windows 8?
I had the same problem... I used Boot-Repair, that helped a lot
Then run Boot-Repair and you should be able to start Windows.
I did a quick search and came across this:
I hope it helps.