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I did not change anything in Preferences->Tweaks. Had I done so I would have mentioned it. The only changes here are:
1. installed a new OS version.
2. Installed a new calibre from your web page the recommended way.
No settings were changed at all. I did just now check in Preferences->Tweaks after reading your reply to see what it is set to, and found it still set to the default:
server_listen_on = '0.0.0.0'
so my inability to connect to localhost is not due to that setting, it has to be something else pecular to the OS upgrade.
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