Comment 9 for bug 1906364

I'd like to give you all an update and outline our plans for this.

The Canonical server team has made analysis of this issue a top priority. We've identified and tested out several possible theories. Our findings suggest that the breakage involves two distinct issues, one the BindTo= issue mentioned above, the other caused by a bug in the docker.io package causing the service to stop on package upgrade; see specifically the service stop command at the end of /var/lib/dpkg/info/docker.io.prerm. We'll use LP: #1870514 to track the former issue, and #1906364 the latter. LP: #1658691 gives some past background for reference.

The tricky part is that unfortunately any change we make to docker.io requires the running of the prerm script (the version of the script already present on your system, not the one we'd be installing), and thus triggers the bug. In other words, updating your system to prevent the bug will cause one more docker stop. Thereafter, the upgrade will not restart the service when rolling out CVE fixes to either containerd or docker.io; it may prompt to do so if running interactively (e.g. https://imgur.com/2Za5dbQ.png), otherwise it should respect the debconf setting.

We would appreciate feedback, testing and/or review of the proposed fix, available in this PPA:

   https://launchpad.net/~bryce/+archive/ubuntu/containerd-sru-lp1870514-docker-dh/