When you boot your system on single user or rescue mode in a Linux which starts handful of services at system boot for basic functionality to enable system administration tasks. When we do “su” to become root you must set a password for root in Debian-based system. The recommended way to become a root in Debian based system (Ubuntu, Linux Mint etc.), use “sudo su” or “sudo -i“. That lets you elevate as a root with your own password.
In this guide, we are going to see how to reset forgotten user password in a single user or rescue mode.
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Boot Linux Mint 20 on a Single User or Rescue Mode
Step 1: Reboot or Turn on your Linux Mint 20 system into Single User Mode.
Step 2: Add parameter “systemd.unit=rescue.target” at the end of line which starts with “linux“
Press “F10” or “Ctrl+X” to boot your system in rescue mode. Press “ESC” at at this stage to discard edits and return to the GRUB menu.