Comment 0 for bug 1726695

The only reference to routes in the man page in the complex example at the very bottom of the page.

It's presented as being a top level element and doesn't specify interface. netplan generate will not compile this useage.

                routes:
                 - to: 0.0.0.0/0
                   via: 11.0.0.1
                   metric: 3

Examining the source code, under doc/example-config, there is a demonstration of the correct routes configuration which is under and interface definition.

ethernets:
    # opaque ID for physical interfaces, only referred to by other stanzas
    id0:
      match:
        macaddress: 00:11:22:33:44:55
      wakeonlan: true
      dhcp4: true
      addresses:
        - 192.168.14.2/24
        - 2001:1::1/64
      gateway4: 192.168.14.1
      gateway6: 2001:1::2
      routes:
       - to: 11.22.0.0/16
         via: 192.168.14.3
         metric: 100
      nameservers:
        search: [foo.local, bar.local]
        addresses: [8.8.8.8]

Please update the man page and fill out a complete list of options available for a route.