pi@raspberrypi:~ $ sudo systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sat 2020-12-12 11:29:45 CET; 10min ago
     Docs: https://docs.docker.com
  Process: 2113 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
 Main PID: 2113 (code=exited, status=1/FAILURE)

dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Service RestartSec=2s expired, scheduling restart.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
dic 12 11:29:45 raspberrypi systemd[1]: Stopped Docker Application Container Engine.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Start request repeated too quickly.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Failed with result 'exit-code'.
dic 12 11:29:45 raspberrypi systemd[1]: Failed to start Docker Application Container Engine.

pi@raspberrypi:~ $ sudo journalctl -xe -u docker.service
--
-- The process' exit code is 'exited' and its exit status is 1.
dic 12 11:29:43 raspberrypi systemd[1]: docker.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit docker.service has entered the 'failed' state with result 'exit-code'.
dic 12 11:29:43 raspberrypi systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: A start job for unit docker.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit docker.service has finished with a failure.
--
-- The job identifier is 1357 and the job result is failed.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Service RestartSec=2s expired, scheduling restart.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
-- Subject: Automatic restarting of a unit has been scheduled
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Automatic restarting of the unit docker.service has been scheduled, as the result for
-- the configured Restart= setting for the unit.
dic 12 11:29:45 raspberrypi systemd[1]: Stopped Docker Application Container Engine.
-- Subject: A stop job for unit docker.service has finished
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A stop job for unit docker.service has finished.
--
-- The job identifier is 1440 and the job result is done.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Start request repeated too quickly.
dic 12 11:29:45 raspberrypi systemd[1]: docker.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit docker.service has entered the 'failed' state with result 'exit-code'.
dic 12 11:29:45 raspberrypi systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: A start job for unit docker.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit docker.service has finished with a failure.
--
-- The job identifier is 1440 and the job result is failed.
lines 144-190/190 (END)


Trozo de journalctl -xe -u

dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.845495708+01:00" level=info msg="Starting up"
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.848758109+01:00" level=info msg="parsed scheme: \"unix\"" module=grpc
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.848829812+01:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.848908367+01:00" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/conta
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.848978125+01:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.852253582+01:00" level=info msg="parsed scheme: \"unix\"" module=grpc
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.852347636+01:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.852439468+01:00" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/conta
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.852497412+01:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.868849047+01:00" level=error msg="failed to mount overlay: no such device" storage-driver=overlay2
dic 12 11:41:40 raspberrypi dockerd[7525]: time="2020-12-12T11:41:40.868951472+01:00" level=error msg="[graphdriver] prior storage driver overlay2 failed: driver not supporte
dic 12 11:41:40 raspberrypi dockerd[7525]: failed to start daemon: error initializing graphdriver: driver not supported
dic 12 11:41:40 raspberrypi systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE