I am trying to set up the environment to build off line. I started with Ubuntu 14.04 and got through the instructions listed in the git repository https://github.com/spark/firmware/blob/develop/docs/gettingstarted.md
I got through all this but Ubuntu 14.04 in not compatible with dfu-util 0.8-1 so this failed. I did see my device when doing a dfl-util -l.
So I whipped my system and loaded Ubuntu 15.10 and followed the instructions again. Now I have dfl-util 0.8-1. Now dfl-util -l returned: dfl-util: failed to open DFU device 2b04:d006. So I cleaned the system again and loaded Ubuntu 15.04. Same behavior as Ubuntu 15.10.
The Make process seems to work, the issue seems to be that I dfl-util cannot connect to the device.
I have done a lot of googling and found several articles mentioning this error but no solutions. Please let me know what is going on.