Objective

The objective is to access root shell and optionally change the default root blank password on Ubuntu 18.04 Bionic Beaver Linux.

Operating System and Software Versions

  • Operating System: - Ubuntu 18.04 Bionic Beaver Linux

Requirements

Privileged access to your Ubuntu System as root or via sudo command is required.

Difficulty

EASY

Conventions

  • # - requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
  • $ - requires given linux commands to be executed as a regular non-privileged user

Instructions

There is no default root password on Ubuntu 18.04 Linux. However, if you need to execute a command with root privileges you can prefix your command with sudo.

The below example will execute the whoami command as a root user. Replace the below whoami command with the command you wish to execute as root:
$ sudo whoami
If you do not wish to use the sudo command every time you need to execute a command with root privileges you can gain the root shell by using the sudo command and its -i option:
$ sudo -i
#
Please note that your command prompt will change from $ to # which indicates that you are currently logged in as root.

If you wish to change the default blank root password and set root password enter:
$ sudo passwd


Once the root password is set, you can login as root by using the su command:
$ su
Change default root password on Ubuntu
Access root shell and change the default root password on Ubuntu 18.04 Bionic Beaver Linux
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