Verified on Cosmic, Bionic and Xenial, the error is not seen on any of the releases:
https://errors.ubuntu.com/?release=Ubuntu%2018.10&package=unattended-upgrades&period=week&version=1.5ubuntu3.18.10.4
https://errors.ubuntu.com/?release=Ubuntu%2018.04&package=unattended-upgrades&period=week&version=1.1ubuntu1.18.04.11
https://errors.ubuntu.com/?release=Ubuntu%2016.04&package=unattended-upgrades&period=week&version=1.1ubuntu1.18.04.7~16.04.3
Verified on Cosmic, Bionic and Xenial, the error is not seen on any of the releases:
https:/ /errors. ubuntu. com/?release= Ubuntu% 2018.10& package= unattended- upgrades& period= week&version= 1.5ubuntu3. 18.10.4
https:/ /errors. ubuntu. com/?release= Ubuntu% 2018.04& package= unattended- upgrades& period= week&version= 1.1ubuntu1. 18.04.11
https:/ /errors. ubuntu. com/?release= Ubuntu% 2016.04& package= unattended- upgrades& period= week&version= 1.1ubuntu1. 18.04.7~ 16.04.3