When using Ubuntu ARM64 server to install the server version before installing Kubuntu, the NetworkManager doesn’t work and shows no available networks. Regardless of your attempts to restart NetworkManager or change Netplan configurations, none of them seem to work.
The reason for this issue is that the ‘renderer: NetworkManager’ line is missing from the network YAML configuration file. To resolve this problem, you should edit your YAML file and add the following line.
to /etc/netplan/00-installer-config.yaml (my example), then restart network manager will fix it.