Ways to check your network config: 

Wireless network settings can be configured  here: 
/usr/share/doc/netplan/examples/wireless.yaml

then run : 

Reference : https://unix.stackexchange.com/questions/550296/how-to-set-up-wifi-on-ubuntu-19-10-server-running-on-raspberry-pi-4
https://askubuntu.com/questions/883305/connecting-to-new-wifi-network

Wired Static IP can be set here: 
/etc/netplan/50-cloud-init.yaml