Probably caused by people aborting an installation attempt due to https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1628053 and then trying again, but by then the group already exists. Just an idea, I haven't debugged it.
-- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1769911 Title: docker.io install fails when docker group exists To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1769911/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
