Longhorn not working on ubuntu


i wanted to test Longhorn on Ubuntu 16.04 but i ended up with this:

clean up longhorn-etcd-server if exists
Unable to find image 'quay.io/coreos/etcd:v3.1.5' locally
docker: Error response from daemon: Get https://quay.io/v1/_ping: x509: certificate signed by unknown authority.

Example is not working.

Any ideas?

Also im wondering if longhorn is stable/production ready with cattle environments ?

Ok, i found out the “x509” seems to be an issue with our firewall solution.