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If this is the password you've forgotten, then here's how to reset it:

Reboot the machine
After the power on self-test screen, press and hold the Shift key
When the Grub boot menu comes up, select to boot in Recovery Mode.
At the Recovery Mode menu, choose to drop to a root shell.
At the prompt, type:

passwd your-user-name

Obviously replace your-user-name with your Ubuntu username.

Choose a new password
Reboot the PC.