This isn't a bug in ubuntu-image. The crash is coming from `snap prepare-image` and u-i just forwards that along because there's nothing more it can do. I opened a bugtask for snapd; here's how to reproduce it.
1. wget the model and the gadget snap from w-ondra's attachements 2. ubuntu-image --channel edge -o ../images/ondra.img -d ../models/pi3-ondra.model --extra-snap ../ondra/pi3-ondra_16.04-0.5_armhf.snap Here's the full traceback so you can see it's coming from snap. DEBUG:ubuntu-image:-> [ 0] make_temporary_directories DEBUG:ubuntu-image:-> [ 1] prepare_image error: attribute "usb-vendor" of slot "zwave-aeon-g5": invalid attribute scalar: 658 ERROR:ubuntu-image:COMMAND FAILED: snap prepare-image --channel=edge --extra-snaps=../ondra/pi3-ondra_16.04-0.5_armhf.snap ../models/pi3-ondra.model /tmp/tmpsbngmcs_/unpack ERROR:ubuntu-image:Full debug traceback follows Traceback (most recent call last): File "/home/barry/projects/ubuntu/allsnappy/ubuntu-image/ubuntu_image/builder.py", line 128, in prepare_image self.args.channel, self.args.extra_snaps) File "/home/barry/projects/ubuntu/allsnappy/ubuntu-image/ubuntu_image/helpers.py", line 116, in snap run(cmd, stdout=None, stderr=None, env=os.environ) File "/home/barry/projects/ubuntu/allsnappy/ubuntu-image/ubuntu_image/helpers.py", line 97, in run proc.check_returncode() File "/usr/lib/python3.5/subprocess.py", line 659, in check_returncode self.stderr) subprocess.CalledProcessError: Command '['snap', 'prepare-image', '--channel=edge', '--extra-snaps=../ondra/pi3-ondra_16.04-0.5_armhf.snap', '../models/pi3-ondra.model', '/tmp/tmpsbngmcs_/unpack']' returned non-zero exit status 1 ** Also affects: snapd (Ubuntu) Importance: Undecided Status: New ** Changed in: ubuntu-image Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1640523 Title: Parse integer-like YAML values as strings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-image/+bug/1640523/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs