Some additional information from docker release notes:
docker.io 20.10.2 introduced a regression that disabled binding to ipv6
addresses: https://github.com/moby/moby/issues/41858
This regression was fixed in docker 20.10.6, see
https://docs.docker.com/engine/release-notes/#20106 , fix is part of
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: docker.io (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1929931
Title: