firstly, you never need to "log in" - just start the program and it logs in
secondly, the temporary password is used for adding a new device to an existing account - you must have a properly configured and running (logged in) instance of ring to do that lastly, in order to restore an account, you need to have backed up the credentials files from ~/.local/share/ring - if ring is not working on at least one machine and you do not have those credentials files then your account is gone forever
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