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How do I reset a lost Administrative (root) password?

I just updated to ubuntu 11.10 and am getting "Your authentication attempt was unsuccessful." I am the only user and am the Administrator, during login on my keyring i set to logon automatically, but it still askes me for my password. So i put in my old one and it works. But when i go to install apps it asks again and nothing works! Also if i go to user accounts and try to unlock or change my password it won't let me! It says under password "None" so what's going on?! I'm new to Ubuntu! Help!

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marked as duplicate by Mitch, con-f-use, Marco Ceppi Aug 29 '12 at 16:47

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

First try creating a new password for your account/username.

You will need to use recovery mode so you have permission to add a new password for your username.

Below is a set of simple instructions.

Using Recovery Mode To Change Your Password

First shutdown your computer.

Then restart whilst holding shift on the keyboard to load grub menu.

Select recovery mode from the grub menu.

Select drop to root shell from the recovery menu.

Use the following command to remount the drive mount -o rw,remount /

Now type passwd username replacing username with your user name ie. 'passwd phil'

You will then be prompted to enter a new password twice (you will not see what you type).

Then type shutdown -r now to restart the computer.

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