The following bash line appears to get the default DNS server out of
NetworkManager:

systemd-resolve --status $( netstat -r | grep default | head -1 | awk '{
print $8 }' ) | grep 'DNS Server:' | sed -e 's/.*DNS Server:
\(\S\+\).*/\1/'

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https://bugs.launchpad.net/bugs/1845824

Title:
  Blueman NAP feeds bad DNS to clients on Ubuntu with dhcpd

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