Mike,
I finally (after several hours) got xFSTK compiling on Ubuntu 14.04 (32-bit). I didn't see drazvan's post until I was well stuck into the task. I'm doing up a HOWTO now, and will post in a separate thread, as it's relevant to anyone wanting to use the flashall.sh script, whether they're flashing Yocto or ubilinux. I'll attach a pre-built .deb here on the forum (if that's OK) to save people the 260MB (approx) of dependent packages to build xFSTK. It's an enormous beast, and should really have a bunch of pre-build binaries available.
I took my .deb and did a dpkg -i onto a freshly built USB key of 14.04 (32-bit), and it installed and worked fine, once I'd got dfu-utils, I was then able to flash a mini-breakout fine.
Rgds,
Dave.