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So I put a bandaid on this by mixing package versions of network-manager
specifically re-introducing the network-manager plugins from 1.18.0
I did this in response to
journalctl messages, like these
`....device plugin: failed to open directory /usr/lib/x86_64-linux-gnu/NetworkManager/1.18.0` ....manager: (wlp0s20u3): 'wifi' plugin not available; creating generic device
But WHY/WHAT is linked to v1.18 while
aptitude seems to claim the package v1.20 satisfies all dependencies…?
So reinstalling network-manager did not help?