Update docker-compose.yml #2
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FYI, if you install docker w/ snap (on ubuntu 18.04), /var/lib/docker does not exists because docker is set up differently. To find the actual folder you need, run docker info | grep "Docker Root Dir:" (mine was /var/snap/docker/common/var-lib-docker).
so changed the path to /var/snap/docker/common/var-lib-docker:/var/lib/docker:ro