Error in the docker installation on Ubuntu 20.04LTS
Problem encountered
Error starting daemon: Error initializing network controller:
list bridge addresses failed: no available network
Solution
$ sudo su root
# ip link add name docker0 type bridge
# ip addr add dev docker0 172.17.0.1/16
Reference
[1] https://github.com/docker/for-linux/issues/123#issuecomment-346546953