ubuntu - Suddenly, I Can't login with correct password

Easily Reset Forgotten in Password Ubuntu Linux [With Video] Jun 17, 2020 [SOLVED] su: Authentication Failure - Zimbra Forums Sep 13, 2014 How to become Root user in Ubuntu Command Line using su Jan 14, 2019 Ubuntu/Postfix/Saslauthd – SASL authentication failure

ubuntu@ip-172-31-35-37:~$ systemctl daemon-reload ==== AUTHENTICATING FOR org.freedesktop.systemd1.reload-daemon === Authentication is required to reload the systemd state. Authenticating as: Ubuntu (ubuntu) Password: polkit-agent-helper-1: pam_authenticate failed: Authentication failure ==== AUTHENTICATION FAILED === Failed to execute

Jan 14, 2019 Ubuntu/Postfix/Saslauthd – SASL authentication failure Apr 26 10:55:19 tcc1 postfix/smtpd[21126]: warning: laptop.local[]: SASL PLAIN authentication failed: generic failure Solution Add the postfix user to the sasl group (this makes sure that Postfix has the permission to access saslauthd): linux - chsh: PAM authentication failed - Server Fault

linux - OPENSSH SFTP-SERVER authentication failure

To check, su to the user and check if you get Authentication Failure, e.g.: $ sudo su - Your account has expired; please contact your system administrator su: Authentication failure (Ignored) To fix: update the expiration on the account: sudo chage -M 300 root Or whatever username you're having issues with in place of root above. solution AUTHENTICATION FAILURES on ubuntu - YouTube Oct 12, 2012 ubuntu - su Authentication failure - Server Fault