Since yesterday, I have got a problem on Thunderbird that fails to connect to servers (imap servers) (both gmail and not-gmail types).

I have tried to uninstall thunderbird via Ubuntu Software and reinstalling it by sudo apt --reinstall install thunderbird, but after rebooting nothing really has changed.

Regarding security settings, connection security is SSL/TLS and authentication method is OAuth2.

Any suggestion?


Apparently solved by removing thunderbird and its related hidden directory .thunderbird located at home. Then reinstalled thunderbird.

I am not sure this is the final and best solution, but, at least for now, is a solution.

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