Comment 13 for bug 1680599

Tested with 1.1ubuntu1.18.04.7~16.04.2 on Xenial:

root@x-uu-lp-1260041:~# unattended-upgrade --dry-run --debug
Unable to parse Unattended-Upgrade::Allowed-Origins.
Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1998, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1565, in main
    allowed_origins = get_allowed_origins()
  File "/usr/bin/unattended-upgrade", line 475, in get_allowed_origins
    allowed_origins = get_allowed_origins_legacy()
  File "/usr/bin/unattended-upgrade", line 454, in get_allowed_origins_legacy
    (distro_id, distro_codename) = s.split()
ValueError: not enough values to unpack (expected 2, got 1)
root@x-uu-lp-1260041:~# cat /var/log/unattended-upgrades/unattended-upgrades.log
2019-03-13 17:23:53,035 ERROR Unable to parse Unattended-Upgrade::Allowed-Origins.
root@x-uu-lp-1260041:~# dpkg -l unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===================-==========================-============-===========================================
ii unattended-upgrades 1.1ubuntu1.18.04.7~16.04.2 all automatic installation of security upgrades