@girish I'm pleased to say that it worked. I had to disable docker and box and reboot, even though I didn't get the exact error you mentioned but something else related to creating the network (duplicate network). I also had to reboot after enabling and restarting box because otherwise the upgrade got stuck, I believe for a similar network creation problem. But once I did that everything worked well and I'm now happily sitting with version 7.6.3 after two subsequent updates. Many thanks for the help with this! Hopefully this thread will be useful for anyone else who might have this issue in future.
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Update to 7.6.1 failing
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