Docker on Ubuntu Server 18.04 LTS with OpenVPN

Hello, i’m trying to install docker in my computer (Ubuntu Server 18.04 LTS) with OpenVPN installed (i have private IP address so i need VPN to make the IP public) but i have this error:

this is the command:
apt-get install docker-ce docker-ce-cli

DEBU[2020-03-27T16:35:04.157748534Z] Cleaning up old mountid : start.
INFO[2020-03-27T16:35:04.157857153Z] stopping event stream following graceful shutdown error="" module=libcontainerd namespace=moby
DEBU[2020-03-27T16:35:04.159193685Z] Cleaning up old mountid : done.
INFO[2020-03-27T16:35:04.160157841Z] stopping event stream following graceful shutdown error=“context canceled” module=libcontainerd namespace=plugins.moby
failed to start daemon: Error initializing network controller: list bridge addresses failed: PredefinedLocalScopeDefaultNetworks List: []: no available network

Thanks a lot