The root Account in Ubuntu is disabled by default because his password is not set. To use root priviledges, basically it's better to use the sudo command with administrative accounts. But if you'd like to use root Account itself by some reason, it's possible to use like follows.

How to Enable SSH on Ubuntu 18.04 | Linuxize Aug 02, 2019 HOWTO: Configure Ubuntu for Active Directory Therefore we need to configure Kerberos 5 and LDAP on Ubuntu in order to manage users in an Active Directory. Throughout this article the following IP addresses are going to be used, adjust appropriately for your network. IP address Description 10.30.2.1 Router and DNS server or proxy 10.30.2.2 DHCP and TFTP server Login. The following steps will guide you through logging in to a Ubuntu Linux Server 16.04 LTS system. To begin logging in to your Ubuntu Linux System, you will need the user name and password information for your account. We will use the primary account we created in our Installing Ubuntu Linux Server 16.04 Tutorial. Install Ubuntu Server on a Raspberry Pi 2, 3 or 4. Running Ubuntu Server on your Raspberry Pi is easy. Just pick the OS image you want, flash it onto a microSD card, load it onto your Pi and away you go.

The root Account in Ubuntu is disabled by default because his password is not set. To use root priviledges, basically it's better to use the sudo command with administrative accounts. But if you'd like to use root Account itself by some reason, it's possible to use like follows.

How to change welcome message (motd) on Ubuntu 18.04 server May 26, 2020

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[6 Steps] Ubuntu Server Setup Guide For Beginners V.16.04