I just ran:
cd /var/discourse git pull ./launcher rebuild app
And am getting:
Your Docker installation is not working correctly See: https://meta.discourse.org/t/docker-error-on-bootstrap/13657/18?u=sam
What do I do?
The error will usually contain multiple lines, the last line just points you here, previous lines point at the actual issue.
docker run -it --rm hello-world
If this is not working, your docker installation is broken.
First start by googling the error you found, remember there is a very active community at https://forums.docker.com/ that may either have had this issue or can help you out.
sudo systemctl restart docker.service