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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?

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Whenever you are trying to boot what? Ubuntu is already installed and you are trying to install Windows 8? Are you using EFI booting? – mdpc Feb 18 '13 at 22:09
Yes, Ubuntu is already installed. I'm trying to install Windows 8. And no, I've been looking about that, couldn't find anything that could help me with it. – Blastcore Feb 18 '13 at 22:12
(I also fixed the post, when I'm trying to boot the Windows installation though the USB) – Blastcore Feb 18 '13 at 22:13
up vote 1 down vote accepted
  1. Use GParted within Ubuntu to shrink your Linux partition so that you have unallocated space available for a new Windows partition

  2. Boot from the Windows 8 DVD and install into that unallocated space

  3. Boot from a Ubuntu or dedicated Boot Repair LiveCD and run Boot Repair as mentioned here

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Now I think I fixed the unknown filesystem, whatever, now I get a bootmgr image is corrupt. The system cannot boot. – Blastcore Feb 18 '13 at 23:11
How did you "fix" it? When are you getting this message - after installing Win8? Also, which OS did your PC originally come with? – Karan Feb 18 '13 at 23:12
Well, instead of moving the ISO files from the ISO itself to the USB, I used WinUSB. And no, I get this error when trying to install Windows 8. When I tell the computer to boot using the USB device it says that "bootmgr image is corrupt". The computer came with no OS, as I built it from scratch. – Blastcore Feb 18 '13 at 23:14
In your BIOS/UEFI settings you may need to disable Secure Boot. For Win8 to USB try Rufus or WinToFlash instead. – Karan Feb 18 '13 at 23:18
Well, I started getting the "unknown filesystem" again. (And I didn't touch anything). This is really a pain. – Blastcore Feb 18 '13 at 23:21

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