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 containerd.io

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: [172.17.0.0/16 172.18.0.0/16 172.19.0.0/16 172.20.0.0/16 172.21.0.0/16 172.22.0.0/16 172.23.0.0/16 172.24.0.0/16 172.25.0.0/16 172.26.0.0/16 172.27.0.0/16 172.28.0.0/16 172.29.0.0/16 172.30.0.0/16 172.31.0.0/16 192.168.0.0/20 192.168.16.0/20 192.168.32.0/20 192.168.48.0/20 192.168.64.0/20 192.168.80.0/20 192.168.96.0/20 192.168.112.0/20 192.168.128.0/20 192.168.144.0/20 192.168.160.0/20 192.168.176.0/20 192.168.192.0/20 192.168.208.0/20 192.168.224.0/20 192.168.240.0/20]: no available network

Thanks a lot
Stefano