Public bug reported: If I install docker.io on xenial, remove it, upgrade to bionic, and install it again, then the docker service doesn’t start.
This is because the xenial docker.io postrm left docker.service and docker.socket masked (via an autogenerated deb-systemd-helper snippet), and the bionic docker.io postinst only unmasks docker.socket. Reproducible test case with LXD: • Create a xenial container: $ lxc remote add --protocol simplestreams ubuntu-minimal https://cloud-images.ubuntu.com/minimal/releases $ lxc launch ubuntu-minimal:16.04 docker-test $ lxc exec docker-test bash root@docker-test:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.6 LTS Release: 16.04 Codename: xenial • Install docker.io: root@docker-test:~# apt update root@docker-test:~# apt -y install docker.io root@docker-test:~# systemctl list-unit-files docker.socket docker.service UNIT FILE STATE docker.service enabled docker.socket enabled 2 unit files listed. root@docker-test:~# docker version -f '{{.Server.Version}}' 18.09.7 • Remove docker.io: root@docker-test:~# apt -y remove docker.io root@docker-test:~# systemctl list-unit-files docker.socket docker.service UNIT FILE STATE docker.service masked docker.socket masked 2 unit files listed. • Upgrade to bionic: root@docker-test:~# script /dev/null -c do-release-upgrade … Restart required To finish the upgrade, a restart is required. If you select 'y' the system will be restarted. Continue [yN] y Script done, file is /dev/null $ lxc exec docker-test bash root@docker-test:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.3 LTS Release: 18.04 Codename: bionic • Install docker.io: root@docker-test:~# apt -y install docker.io root@docker-test:~# systemctl list-unit-files docker.socket docker.service UNIT FILE STATE docker.service masked docker.socket enabled 2 unit files listed. root@docker-test:~# docker version -f '{{.Server.Version}}' Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? root@docker-test:~# systemctl start docker Failed to start docker.service: Unit docker.service is masked. • Workaround: root@docker-test:~# systemctl unmask docker Removed /etc/systemd/system/docker.service. root@docker-test:~# systemctl start docker root@docker-test:~# docker version -f '{{.Server.Version}}' 18.09.7 ** Affects: docker.io (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1844894 Title: docker doesn’t start in bionic (Unit docker.service is masked), if previously installed+removed in xenial To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1844894/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
