sudo docker ps -a

Server:
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

sudo systemctl start docker
Job for docker.service failed because the control process exited with error code.
See “systemctl status docker.service” and “journalctl -xeu docker.service” for details.

Solution:

sudo dockerd –debug
INFO[2025-08-23T11:34:12.941011318+02:00] Starting up
DEBU[2025-08-23T11:34:12.941240625+02:00] Listener created for HTTP on unix (/var/run/docker.sock)
INFO[2025-08-23T11:34:12.941306951+02:00] OTEL tracing is not configured, using no-op tracer provider
INFO[2025-08-23T11:34:12.941334654+02:00] CDI directory does not exist, skipping: failed to monitor for changes: no such file or directory dir=/var/run/cdi
INFO[2025-08-23T11:34:12.941339333+02:00] CDI directory does not exist, skipping: failed to monitor for changes: no such file or directory dir=/etc/cdi
DEBU[2025-08-23T11:34:12.945396004+02:00] Golang’s threads limit set to 223560
INFO[2025-08-23T11:34:12.945519629+02:00] Creating a containerd client address=/run/containerd/containerd.sock timeout=1m0s
DEBU[2025-08-23T11:34:12.945575486+02:00] metrics API listening on /var/run/docker/metrics.sock
DEBU[2025-08-23T11:34:12.946974992+02:00] Using default logging driver json-file
DEBU[2025-08-23T11:34:12.947048603+02:00] No quota support for local volumes in /var/lib/docker/volumes: Filesystem does not support, or has not enabled quotas
DEBU[2025-08-23T11:34:12.947161688+02:00] processing event stream module=libcontainerd namespace=plugins.moby
DEBU[2025-08-23T11:34:12.968009806+02:00] [graphdriver] priority list: [overlay2 fuse-overlayfs btrfs zfs vfs]
ERRO[2025-08-23T11:34:12.968820541+02:00] failed to mount overlay: no such device storage-driver=overlay2
ERRO[2025-08-23T11:34:12.968826462+02:00] [graphdriver] prior storage driver overlay2 failed: driver not supported
DEBU[2025-08-23T11:34:12.968830510+02:00] daemon configured with a 15 seconds minimum shutdown timeout
DEBU[2025-08-23T11:34:12.968834798+02:00] start clean shutdown of all containers with a 15 seconds timeout…
DEBU[2025-08-23T11:34:12.969052833+02:00] Cleaning up old mountid : start.
DEBU[2025-08-23T11:34:12.969121093+02:00] Cleaning up old mountid : done.
failed to start daemon: error initializing graphdriver: driver not supported

Reboot