There's no reason for anything in netplan to care what the device is
numbered '9'; and it's not even the last interface configured in the
yaml file. This smells like a systemd bug.
Could you please attach the file that netplan generates in
/run/systemd/network, as well as /var/log/syslog to see if systemd-
networkd reports any error?
** Changed in: nplan (Ubuntu)
Status: New => Incomplete
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Netplan does not allow greater that 8 nics to be configured
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