Ubuntu 20.04 fails to join Windows AD domain

I am new with Ubuntu / Linux. I am attempting to join a Ubuntu 20.04 machine to a Windows domain using the following command:

sudo realm join -v ad1.example.com

This fails with the following error:

root@computer:~# sudo realm join -v example.org * Resolving: _ldap._tcp.example.org * Performing LDAP DSE lookup on: 10.0.5.5 * Successfully discovered: example.org
Password for Administrator: * Unconditionally checking packages * Resolving required packages * LANG=C /usr/sbin/adcli join --verbose --domain example.org --domain-realm EXAMPLE.ORG --domain-controller 10.0.5.5 --login-type user --login-user Administrator --stdin-password * Using domain name: example.org * Calculated computer account name from fqdn: COMPUTER * Using domain realm: example.org * Sending NetLogon ping to domain controller: 10.0.5.5 * Received NetLogon info from: DC01.example.org * Wrote out krb5.conf snippet to /var/cache/realmd/adcli-krb5-ZG1Ish/krb5.d/adcli-krb5-conf-dobebh ! Couldn't get kerberos ticket for: : New password cannot be zero length
adcli: couldn't connect to example.org domain: Couldn't get kerberos ticket for: : New password cannot be zero length ! Failed to join the domain
realm: Couldn't join realm: Failed to join the domain

Any help would be greatly appreciated.

2 Answers

Try:

sudo realm join --user=Administrator -v example.org

And maybe:

kinit 

before the join command.

This turned out to be the domain user had the box "Must change password on the next login" checked.

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