Occurs to me that I might have had docker running in a screen session to get debug messages for the intermittent bug where docker dies of a signal. I forget if I did, but that might have prevented a clean shutdown on the upgrade?
I rebooted the host, and /var/lib/docker still had a lot of images in it, but docker didh't know about anything. And starting new images failed with some error message I didn't note down. I had to purge docker, rm -rf /var/lib/docker and reinstall to get back to a usable state. -- see shy jo
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