My first Yun conversion went smoothly. But my second one failed (error detailed below). I surmised this was a issues with free space on / (of course that's why I was happy to see this extension scheme). I recalled I was at about 90% before running the conversion script. I removed a couple of packages to get to 83% full on / and re-ran the sketch. It ran correctly.
Bottom line is you may want to ensure you have about 80% free space on / before running this conversion.
Software list updated. Installing software (this will take a while)...
err. installing e2fsprogs mkdosfs fdisk