I have 4 accounts setup on freshly installed Thunderbird 60.2.1. Three were working fine and forth on connection will get a message "Authentication failure while connecting to imap.gmail.com". In manual account settings I found that was used User Name of first account, changing it to proper one will not make that account working but also changing User Name in the first account (the same as set up in SMTP server dialog box in forth account) and both accounts will not work. No such problem on another computer or login directly to gmail through the Firefox. Tried to uninstall Thunderbird completely and install it again - the same problem. OS - Robolinux ver.10.3 fresh installation. What could be a problem here? Thanks in advance.