Verifique sua sintaxe.
$ sudo netplan --debug apply
network:
version: 2
renderer: networkd
ethernets:
enp1s0f0:
dhcp4: false
dhcp6: false
enp1s0f1:
dhcp4: false
dhcp6: false
bonds:
bond0:
dhcp4: false
dhcp6: false
interfaces:
- enp1s0f0
- enp1s0f1
addresses: [192.168.3.250/24]
gateway4: 192.168.3.1
parameters:
mode: 802.3ad
nameservers:
addresses: [8.8.8.8,8.8.4.4]