I just wanted to say thank you! Reading your post spared me a lot of headaches!

I manually installed ddclient 3.11.0 from github on Ubuntu 22.04.1 LTS following the manual installation guide from github: https://github.com/ddclient/ddclient#ma … stallation

Additional to the change that you proposed I had to make another change in /etc/init.d/ddclient swapping:

DAEMON=/usr/sbin/$NAME
to
DAEMON=/usr/bin/$NAME

Other tips that I have is to double check that you're using /etc/ddclient/ddclient.conf
I believe in earlier versions it was using /etc/ddclient.conf by default so make sure that you're using the correct file location for the config in case you're upgrading.

And finally it's not necessary to have "daemon" or "pid" statements in /etc/ddclient/ddclient.conf
If you're using the default /etc/systemd/system/ddclient.service
since that already passes deamon and pid via command line argmunets.

I hope this is helpful for someone else who also finds this thread through Google like me.