No Docker daemon yet? Review the Ubuntu installer package removals, repository, group access and service restarts first. Already have Docker? Go directly to the relevant application guide and check existing ports and mounts.
Choose by symptom
Need private-network access instead? Use the OpenVPN client guide, supply a reviewed config/login pair and inspect the local DNS helper separately. The Docker installer targets 24.04.4; the VPN source names 20.04/22.04/24.04. These are source scopes, not real-host test claims.