Ubuntu

CLI

Run ssh in background

ctrl + z to put the job into background, and use bg to run it

Network

WLAN

Connect to network (Someone told me the following method is WRONG, but ie works to me):
cd to /etc/netplan, vi or create 50-cloud-init.yaml with following content

network:
  ethernets:
    eth0:
      dhcp4: true
      optional: true
  version: 2
  wifis:
      wlan0:
        dhcp4: true
        access-points:
          "<SSID>":
            password: "<PASSWORD>"