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Join Ubuntu 20.04 to Active Directory with SSSD and SSH Access  Overview This guide walks you through joining an Ubuntu 20.04 machine to an Active Directory domain using SSSD, configuring PAM for AD user logins over SSH, and enabling automatic creation of home directories upon first login. We’ll also cover troubleshooting steps and verification commands. Environment Used Component Value Ubuntu Client       ubuntu-client.bazboutey.local Active Directory FQDN   bazboutey.local Realm (Kerberos)   BAZBOUTEY.LOCAL AD Admin Account   Administrator Step 1: Prerequisites and Package Installation 1.1 Update system and install required packages bash sudo apt update sudo apt install realmd sssd libnss-sss libpam-sss adcli \ samba-common-bin oddjob oddjob-mkhomedir packagekit \ libpam-modules openssh-server Step 2: Test DNS and Kerberos Configuration Ensure that the client can resolve the AD domain and discover services. 2.1 Test domain name resol...