System has not been booted with systemd as init system (PID 1). Can't operate

💡System has not been booted with systemd as init system (PID 1). Can't operate
설치 후 오류가 계속 뜨고 실행이 안 됨

sudo /etc/init.d/docker start or sudo service docker start or /etc/init.d/docker start
sudo service
실행 시 작동

docker.io공식 우분투 저장소 의 패키지 를 사용하는경우
$ sudo dockerd

💡Got permission denied while trying to connect to the Docker daemon socket at
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/containers/json?all=1: dial unix /var/run/docker.sock: connect: permission denied

sudo chmod 666 /var/run/docker.sock