Netplan
From DWIKI
Ubuntu network configuration new style
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An error occurred: 'NetplanApply' object has no attribute 'state
That's because netplan is broken, try:
netplan try --state /etc/netplan
`gateway6` has been deprecated, use default routes instead
Use:
routes: - to: default via: fe80::1
Error in network definition: expected mapping (check indentation)
It seems to prefer list of addresses in square brackets
`gateway4` has been deprecated, use default routes instead.
Try
routes: - to: default via: 192.168.10.1