How to reset a forgotten Ubuntu password?

Question: How to reset a forgotten Ubuntu password?

Answer:

• Boot up your System
• When the Grub screen appears choose "Ubuntu x.xx, kernal x.x.x-xx-generic (recovery mode)". The x's are in the place of the version numbers
• On the next screen select "Drop to root shell prompt"
• Once in the root shell prompt use the passwd command to reset your password
  

  password USERNAME

  Replace USERNAME with the username who's password you need to reset
• Next enter the following commands to force changed blocks to disk and reboot the System
  

   
  sync
  reboot -f
   

  
  sync = Writes any data buffered in memory out to disk and ensures that everything in memory is written to disk.
  reboot -f = Reboots the system. -f forces the system to reboot
• After the reboot, you should be able to login with the new password.

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