How to fix: fatal: Authentication failed for https
There are two important concepts for users: authentication, and accounts. With Active Directory authentication uses the Kerberos 5 protocol, and account information uses LDAP. Therefore we need to configure Kerberos 5 and LDAP on Ubuntu in order to manage users in an Active Directory. Easily Reset Forgotten in Password Ubuntu Linux [With Video] Jun 17, 2020 [SOLVED] su: Authentication Failure - Zimbra Forums Sep 13, 2014
Ubuntu 14.04, 16.04, and 18.04 instances must be reverse-resolvable in the DNS before a realm can work with Microsoft AD. Otherwise you may encounter one of the following two scenarios: Otherwise you may encounter one of the following two scenarios:
It got rid of a persistent (uncancelable) 'Authentication required to perform file operations' dialog at the top left of the screen for me. However, it does close all applications, so it is not unlike a logout/login without any questions to save work. Careful; you will loose work if you have not saved things. – Roel Van de Paar Jun 9 at 23:04
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May 05, 2012 Ubuntu 18.04 Setup SSH Public Key Authentication - nixCraft