xe u

 sudo journalctl -xe -u docker.service
-- A stop job for unit docker.service has finished.
--
-- The job identifier is 1274 and the job result is done.
dic 12 11:29:40 raspberrypi systemd[1]: Starting Docker Application Container Engine...
-- Subject: A start job for unit docker.service has begun execution
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit docker.service has begun execution.
--
-- The job identifier is 1274.
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.075989478+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.079377089+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.079447959+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.079532015+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.079587237+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.082654941+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.082742033+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.082827978+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.082891145+01:00" level=info
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.092433589+01:00" level=error
dic 12 11:29:41 raspberrypi dockerd[2039]: time="2020-12-12T11:29:41.092514330+01:00" level=error
dic 12 11:29:41 raspberrypi dockerd[2039]: failed to start daemon: error initializing graphdriver
dic 12 11:29:41 raspberrypi systemd[1]: docker.service: Main process exited, code=exited, status=
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStart= process belonging to unit docker.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
dic 12 11:29:41 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 11:29:41 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 1274 and the job result is failed.