Fix software updates in Cockpit in Ubuntu 20.04
Software updates on the Ubuntu system will fail because Cockpit on Ubuntu doesn't detect a network connection. To fix this, you must use NetworkManager instead of the default networkd.
You need to be root or sudo root for all these commands. Edit your netplan file in /etc/netplan and add the following two lines under network:.
version: 2 renderer: NetworkManager
Remember that spaces matter in YAML files.
You will then need install network-manager.
apt install network-manager
Disable networkd.
systemctl disable systemd-networkd
Enable NetworkManager
systemctl enable network-manager
Apply your new settings
netplan apply
Profit!