Introduction:

Forgetting the root password in Linux can be a daunting experience. However, there are several methods to retrieve the root password and regain access to your system. Below are some of the common techniques:

Method 1: Single-User Mode

1. Reboot your Linux system.

2. When the GRUB menu appears, select the 'Advanced options for Ubuntu'.

3. Choose the recovery mode option.

4. Select the 'root' option to drop to a root shell prompt.

5. Type the command 'passwd' to reset the root password.

Method 2: Live CD/USB

1. Boot your system using a Live CD/USB.

2. Mount your Linux partition.

3. Edit the /etc/shadow file and remove the hashed password for the root user.

4. Reboot your system and set a new root password.

Method 3: Grub Rescue Mode

1. Boot into GRUB rescue mode.

2. Select the Linux installation.

3. Use the 'set' command to view the current root and prefix settings.

4. Set the root and prefix manually using the 'set' command.

5. Type 'insmod normal' and 'normal' to boot into the system.

Conclusion:

It's essential to keep your root password secure and manageable. In case you forget it, the above methods can help you retrieve it and regain access to your Linux system. Remember to create a secure password and store it in a safe place to avoid such situations in the future.