WARNING **: 00:00:00.000: gateway4 has been deprecated, use default routes instead. See the ‘Default routes’ section of the documentation for more details.

แก้ไขไฟล์ /etc/netplan/xxxxxxxxxxxxxxx.yaml

ลบ

gateway4: x.x.x.x

เพิ่ม

routes:
  - to: default
    via: x.x.x.x

apply service

$ netplan apply

ตัวอย่าง

# /etc/netplan/00-installer-config.yaml

network:
  ethernets:
    ens160:
      addresses:
      - 192.168.1.2/24
      routes:
      - to: default
        via: 192.168.1.1
      nameservers:
        addresses:
        - 9.9.9.9
        - 8.8.8.8
        search: []
  version: 2