Ubuntu 12.04 does not allow root login by default. When you reach the login screen, you'll only see options for regular users and guest access. After logging in as a normal user, you may need to make some system-level changes. To gain root privileges, open a terminal and type `sudo -s`. Enter your current user password when prompted, and you'll be switched to the root shell.
Next, edit the LightDM configuration file using the command: `sudo vi /etc/lightdm/lightdm.conf`. Modify the file to include the following lines:
```
greeter-show-manual-login=true
allow-guest=false
```
Your updated configuration should look like this:
```
[SeatDefaults]
greeter-session=unity-greeter
user-session=ubuntu
greeter-show-manual-login=true # Enables manual login
allow-guest=false # Disables guest login
```
After saving the changes, you can enable the root account by setting a password. Run the command `sudo passwd root` and follow the prompts to set a new password for the root user. Once done, restart your system. At the login screen, you should now see an option labeled "Login," which allows you to log in as root.
It's important to note that Ubuntu does not assign a default root password. Instead, it generates a random one at each boot. However, you can easily change it using the `sudo passwd root` command. After entering your current user password, you'll be asked to set a new password for the root account. Confirm the password, and you’ll receive a message indicating that the password has been successfully updated.
If you're logged in as an administrator, you have full control over the system and can modify user settings, including enabling or disabling root login. You can also adjust these settings through the graphical interface under "User and Group" settings. This allows for greater flexibility when managing system access.
By making these adjustments, you can configure your Ubuntu system to suit your specific needs, whether you're working with standard user accounts or require elevated privileges for administrative tasks. Always ensure that security best practices are followed when handling root access.
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