Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 727, in <module>
    main(options)
  File "/usr/bin/unattended-upgrade", line 504, in main
    ["dpkg", "--force-confold", "--configure", "-a"], env=env)
  File "/usr/lib/python2.7/subprocess.py", line 537, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
CalledProcessError: Command '['dpkg', '--force-confold', '--configure', '-a']' returned non-zero exit status 2