Code review comment for lp:~mvo/ubuntu-system-image/lp1271684

Hi Michael - thanks for this branch! Somehow I missed this bug. The branch looks good, I'll merge this into trunk for s-i 2.3. Thanks!

FWIW, you can just run `tox` at the command line to run the test suite. That has the side-effect of building the environment to run the tests. `python3 -m nose2 -v` *can* work, but it may not have everything set up. I'll update the README with details.