Comment 2 for bug 1615757

This bug also affects the click-apparmor autopkgtests. I'm surprised that click was promoted if click-apparmor's autopkgtest failed. Here are steps to reproduce in a clean VM:

$ sudo apt-get install click ubuntu-sdk-libs
$ sudo click install --user=jamie /tmp/com.example.click-apparmor-test_0.1_all.click

$ sudo click install --user=jamie /tmp/com.example.click-apparmor-test_0.1_all.click --allow-unauthenticated
WARNING:root:Signature check failed, but installing anyway as requested
ERROR:root:['dpkg', '--force-not-root', '--force-bad-path', '--force-architecture', '--instdir', '/opt/click.ubuntu.com/com.example.click-apparmor-test/0.1', '--admindir', '/opt/click.ubuntu.com/com.example.click-apparmor-test/0.1/.click', '--path-exclude', '*/.click/*', '--log', '/opt/click.ubuntu.com/.click/log', '--no-triggers', '--install', '/tmp/com.example.click-apparmor-test_0.1_all.click'] failed with exit_code 1:

Traceback (most recent call last):
  File "/usr/bin/click", line 110, in <module>
    sys.exit(main())
  File "/usr/bin/click", line 106, in main
    return mod.run(args)
  File "/usr/lib/python3/dist-packages/click/commands/install.py", line 66, in run
    quiet=not options.verbose)
  File "/usr/lib/python3/dist-packages/click/install.py", line 463, in install
    path, user=user, all_users=all_users, quiet=quiet)
  File "/usr/lib/python3/dist-packages/click/install.py", line 419, in _unpack
    **kwargs)
  File "/usr/lib/python3.5/subprocess.py", line 626, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.5/subprocess.py", line 708, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['dpkg', '--force-not-root', '--force-bad-path', '--force-architecture', '--instdir', '/opt/click.ubuntu.com/com.example.click-apparmor-test/0.1', '--admindir', '/opt/click.ubuntu.com/com.example.click-apparmor-test/0.1/.click', '--path-exclude', '*/.click/*', '--log', '/opt/click.ubuntu.com/.click/log', '--no-triggers', '--install', '/tmp/com.example.click-apparmor-test_0.1_all.click']' returned non-zero exit status 1

Note, the above was with debsig-verify installed but had the same error with it uninstalled.

$ apt-cache policy click
click:
  Installed: 0.4.44+16.10.20160811.1-0ubuntu1
  Candidate: 0.4.44+16.10.20160811.1-0ubuntu1
  Version table:
 *** 0.4.44+16.10.20160811.1-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu yakkety/main amd64 Packages
        100 /var/lib/dpkg/status

This works fine on xenial.