If you’ve ever forgotten your password, you aren’t alone; it’s probably one of the most common tech support problems. I’ve encountered over the years. Luckily if you are using Ubuntu they made it incredibly easy to reset your password.
Reboot your computer, and then as soon as you see the GRUB loading screen, make sure to hit the ESC key so that you can get to the menu.
If you have the option, you can choose the recovery mode item on the menu, usually found right below your default kernel option.
Then choose Drop to root shell prompt from this menu.
This should give you a root shell prompt.
You can use the following command to reset your password:
passwd
After changing your password, use the following commands to reboot your system. (The sync command makes sure to write out data to the disk before rebooting)
sync
reboot –f
I found that the -f parameter was necessary to get the reboot command to work for some reason. You could always hardware reset instead, but make sure to use the sync command first.
And now you should be able to login without any issues.
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