Netplan

Ubuntu 20.04 LTS & Netplan

Linux

Assume you got a fresh Machine with DHCP …

Ubuntu with DHCP Config

cat /etc/netplan/01-netcfg.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    ens192:
      dhcp4: true
  version: 2

and you’d like to switch to Static IP, ask google how todo it an give try:

Static IP with Netplan

# This is the network config written by 'subiquity'
network:
  version: 2
  ethernets:
    ens192:
      addresses:
      - 1.2.3.4/24
      gateway4: 1.1.1.1
      nameservers:
        addresses:
        - 8.8.8.8
        - 8.8.4.4
        search:
        - world.net

then reboot … and the machine is gone. ok, not really gone, but from IP perspective definitly. it just reboots and come back without default gateway :(