Docker not starting " could not delete the default bridge network: network bridge has active endpoints""

I had a similar issue after upgrading.

Run

sudo mv /var/lib/docker/network/files/ /tmp/dn-bak

to reset your networks. Then restart docker (sudo systemctl restart docker or sudo service docker restart depending on your OS).

If everything works again you can delete the dn-bak directory.

linux docker debian

Just restarting docker was enough. As @schmunk mentioned

sudo systemctl restart docker

sudo /etc/init.d/docker restart

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