I have recently dual booted to ubuntu 13.10 with windows 8. I have windows 8 before having ubuntu, I had to do a boot-repair so I can choose which to load, it all went fine, no problem.
But then again I decided to upgrade to windows 8.1, I thought I can just install it, then just use a live usb, to do a boot-repair again, but it gave me this error
Kernel panic - not syncing: VFS: Unable to mount root (0,0)
What should I do?