ubuntu 22.04 netplan apply 後出現 Permissions for /etc/netplan/00-installer-config.yaml are too open. Netplan configuration should NOT be accessible by others

 預設檔案權限為 -rw-r--r--

改成 -rw------- 就好

sudo chmod 600 /etc/netplan/00-installer-config.yaml

如果出現下面的訊息

WARNING:root:Cannot call Open vSwitch: ovsdb-server.service is not running.

安裝 openvswitch-switch 就好