I've installed 12.0.4 alongside windows 8 on a UEFI based system.
It boots into Linux fine from its menu and it boots into Windows 8 if I pick the third option on the menu - which doesn't have a sensible name
I also have lots of menu entries that seem to be duplicates.
So how can I get rid of those duplicate entries and change the oddly titled menu entry to boot Win 8
Here's my boot info