After pulling my hair for several days, I found this:

https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1638842

/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf has the
following content:

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:wwan

Removing the file and restarting NetworkManager did the trick.

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https://bugs.launchpad.net/bugs/1658921

Title:
  NetworkManager does not manage wired connection

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