Comment 13 for bug 1777094

The problem lives in the [Unit] section in the After= directive which when modified as follows raises dnsmasq.service unbroken on boot:

sed -i 's/After=network.target/After=NetworkManager-wait-online.service/' /etc/systemd/system/multi-user.target.wants/dnsmasq.service

That's a fairly tidy, and *reproducible* fix which works on successive reboots.