How to Reset your Ubuntu User Password

If you forgot the password and cannot log in (Recovery Mode)

This is the most important recovery method.

Step-by-step

1. Reboot

2. Hold Shift (BIOS) or Esc (UEFI) to open GRUB

3. Select:

   Advanced options for Ubuntu
   

4. Choose:

   Ubuntu, with Linux … (recovery mode)
   

5. Select:

   root – Drop to root shell prompt
   

Remount filesystem as read-write

Recovery mode mounts / as read-only.

mount -o remount,rw /

Reset the password

passwd username

Example:

passwd duc

Reboot

reboot

You can now log in normally.