kazulog@sv1:~$ printf 'network:\n  version: 2\n  ethernets:\n    ens3:\n      addresses: 192.168.100.10/24\n' | sudo tee /etc/netplan/99-broken.yaml > /dev/null
kazulog@sv1:~$ sudo chmod 600 /etc/netplan/99-broken.yaml
kazulog@sv1:~$ sudo netplan generate
/etc/netplan/99-broken.yaml:5:18: Error in network definition: expected sequence
      addresses: 192.168.100.10/24
                 ^
kazulog@sv1:~$ echo exit=$?
exit=1
kazulog@sv1:~$ sudo rm /etc/netplan/99-broken.yaml
kazulog@sv1:~$ sudo chmod 644 /etc/netplan/60-ens3.yaml
kazulog@sv1:~$ sudo netplan generate
** (configure:3014): WARNING **: 13:00:58.443: Permissions for /etc/netplan/60-ens3.yaml are too open. Netplan configuration should NOT be accessible by others.
kazulog@sv1:~$ sudo chmod 600 /etc/netplan/60-ens3.yaml