我已将Docker安装到Ubuntu 18.04.3。
尝试运行hello-world时，出现以下错误：
$ sudo docker run hello-world
docker: Error response from daemon: AppArmor enabled on system but the docker-default profile could not be loaded: running `/sbin/apparmor_parser apparmor_parser -Kr /var/lib/docker/tmp/docker-default464501935` failed with output: apparmor_parser: Unable to replace "docker-default". Permission denied; attempted to load a profile while confined?
当尝试在特权模式下运行以避开apparmor时，得到以下信息：
$ sudo docker run --privileged hello-world
docker: Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "process_linux.go:430: container init caused \"rootfs_linux.go:58: mounting \\\"proc\\\" to rootfs \\\"/var/lib/docker/vfs/dir/ef533bc68e1b2b60e7d88efa55b2a8fef3f77c2508e56aefb47d29ecdb4516fd\\\" at \\\"/proc\\\" caused \\\"permission denied\\\"\"": unknown.
ERRO[0000] error waiting for container: context canceled
还需要什么权限？