在ubuntu docker中更新时显示错误

Question

当我在 ubuntu机器上运行命令时：易于获取更新

显示错误：

W: GPG error: https://apt.dockerproject.org ubuntu-trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F76221572C52609D

也命令：

docker run --rm -ti -p 8888:8888 kurento/kurento-media-server-dev:latest

显示错误：

docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "process_linux.go:301: running exec setns process for init caused \"exit status 23\"": unknown.

Docker version :
Docker version 18.06.3-ce, build d7080c1

请帮助？