Matt Roberts's questions

I get this error when trying to netplan apply. eno2 exists but netplan says it's not defined.

network:
    version: 2
    renderer: networkd
    bonds:
            bond0:
                    interfaces: [eno1, eno2]
                    addresses: [192.168.0.104/24]
                    gateway4: 192.168.0.1
                    parameters:
                            mode: 802.3ad
                    nameservers:
                            addresses: [192.168.0.2]
                    dhcp4: false
                    optional: true

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:00:00:00:00:da brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.12/24 brd 192.168.0.255 scope global dynamic eno1
       valid_lft 6374sec preferred_lft 6374sec
    inet6 fe80::ae1f:6bff:fefc:a9da/64 scope link
       valid_lft forever preferred_lft forever
3: eno2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:00:00:00:00:db brd ff:ff:ff:ff:ff:ff