Link negotiation settings with netplan

I set a static IP with Netplan on my desktop, but the link negotiation keeps resetting to “Ignore” every reboot on my Plasma desktop.

How can I make it permanent?

Was the answer you got here sufficient? That question’s way above my head.

You could also try different guides or see how the instructions differ:

Netplan - How To Configure Static IP Address in Ubuntu 18.04 using Netplan