Ethernet stopped working after last apt upgrade

Yesterday I’ve updated the packages by apt upgrade and Ethernet in my Rock Pi has stopped working.

I’ve changed the settings in /etc/ as I had them backed up and it didn’t helped.

Sometimes it works, sometimes not, nothing has changed beside this last apt upgrade.
Sometimes I can ping but mostly not.

Nothing special has changed from my side on the Rock Pi that could have stopped the Ethernet.

Anyone observing the same?

Seems like sth changed /etc/apt/sources.list - changing it back has solved the problem. Also I have uninstalled network-manager to make everything work. Maybe I’ll install network-manager once again.

Once system was presenting as focal, once as bionic. I’ve changed sources.list to focal, updated some packages and everything is ok now.