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

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https://bugs.launchpad.net/bugs/1640523

Title:
  Parse integer-like YAML values as strings

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