Web Reference: I know my password and I am typing it correctly, but su indicates Authentication failure. So I checked on the internet and then went into recovery mode and changed my user's password to what I was entering before. This tutorial will guide you through the process of troubleshooting su authentication failures on Linux, covering common causes, configuration settings, and best practices for secure su usage. It is possible to login as root user directly but not possible to escalate to root using su. Users cannot use su - command to switch user getting "su: Authentication failure".
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