I thought it would be a good idea to finally take the password off my little netbook since it has never actually been of any use, and has mostly just slowed down . But when I went to change my password, there wasn't even an option to make it blank, and any attempt to make it a few easy characters was met with "Password too weak".

So I did what any good geek would do and popped open the terminal, read the manual entry for passwd and quickly used the -d option to remove the password from my account. It all went well for a couple days (I even managed to also make my keychain password blank) until I tried to update the thing.

My sudoers password is not blank, and it's not my old password. I have no idea what it is. How do I reset it (or even better, make it blank) without the use of the sudo command?

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4 Answers

Go to terminal type who am i then type passwd and enter the password you want. You will be able to use that password to change your password on user accounts.

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If you messed up your sudoers file, you'll need to:

• Reboot into recovery mode (hit escape during boot, choose the recovery mode option on the grub screen)
• Choose the 'Enable networking' option (if you don't your filesystem will be mounted as read-only. who knew)
• Chosee the 'Drop to root shell' option
• Run visudo, fix your file
• Reboot with normal grub option

source :-

You can install linux on machine without losing data . only be carefull aboout that use same username . if you want really cracking password i will look for it

After switch on your PC , you will see GRUB menu . In the GRUB menu choose recovery mode and then choose root option . there type this command

passwd

Then Give your new password .

then restart.