So, I've been trying to install Windows 8 along with Ubuntu, so I've got the ISO but whenever I try to boot the Windows installation though the USB I get the "unknown filesystem", which doesn't let me install anything.
How do I fix this?
Use GParted within Ubuntu to shrink your Linux partition so that you have unallocated space available for a new Windows partition
Boot from the Windows 8 DVD and install into that unallocated space
Boot from a Ubuntu or dedicated Boot Repair LiveCD and run Boot Repair as mentioned here
3 years ago