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

I have applied every solution available on internet but still I cannot run Docker. I want to use Scrapy Splash on my server. Here is `history` of commands I ran. docker run -p 8050:8050 scrapinghub/splash sudo docker run -p 8050:8050 scrapinghub/splash sudo usermod -aG docker $(whoami) sudo docker run -p 8050:8050 scrapinghub/splash newgrp docker sudo docker run -p 8050:8050 scrapinghub/splash reboot sudo docker run -p 8050:8050 scrapinghub/splash docker run -p 8050:8050 scrapinghub/splash You can see I tried to restart my server as well, but it didnt help. see output of `ps -aux | grep docker` root@mani:/var/www/html# ps aux | grep docker root 8524 0.0 0.8 127904 13964 ? Ssl 17:21 0:00 /usr/bin/dockerd --raw-logs root 8534 0.0 0.3 90588 5012 ? Ssl 17:21 0:00 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc root 8543 0.0 0.0 8812 764 pts/1 S+ 17:21 0:00 grep --color=auto docker root 16356 0.0 0.0 17200 964 pts/1 S 17:14 0:00 newgrp docker root 20080 0.0 0.0 17200 964 pts/1 S 17:06 0:00 newgrp docker root 30221 0.0 0.0 17200 964 pts/1 S 17:09 0:00 newgrp docker but it gives the error: > Cannot connect to the Docker daemon at `unix:///var/run/docker.sock`. Is the docker daemon running?.