Yeah I've looked at these, but they don't solve the problem. I can't seem to mount the image.

Hi, I'm currently using Berryboot as my bootloader and I have raspbian and kali linux installed. I am trying to use this guide to add Plan 9 into Berryboot. http://www.howtogeek.com/141325/how-to-multi-boot-your-raspberry-pi-with-berryboot/ However, when i key in sudo kpartx -av 9pi.img, i get the f...