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How do I reset a lost administrative password?

For some reasons i have deleted my user with his /home/. And now i have guest account and root, for which i can't set password.

And i need to add a new user. Any ideas ?

I am using Ubuntu 12.10

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marked as duplicate by psusi, Jorge Castro, Eliah Kagan, fossfreedom Dec 19 '12 at 9:26

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2 Answers 2

From the ubuntu CD, open terminal, and mount the root partition:

$ sudo mount /dev/sda1 /mnt # Example, change /dev/sda1 to your root partition

Then, use chroot:

$ sudo chroot /mnt

Voila, you have root access. Now you need to use adduser:

$ sudo useradd username
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The third command doesn't need sudo, as you'd have sudo permissions already. –  papukaija Jul 8 '13 at 22:51

You can add a new user or change the existing password in 2 ways:

  1. Boot the computer using a live CD, mount the ubuntu partition and then chroot to it and then do useradd username to add a new user, or change the password of existing users using passwd username command eg passwd root to change the root password

  2. Another method(if you dont have a live CD) would be to hack the system through the grub menu. while booting press shift to enter the grub menu and then press e to edit the ubuntu grub entry.Then edit the inintrd line or add rw S init=/bin/sh and then press b or ctrl + x.This would boot up and bring up a terminal with root privileges. You can then add a new user or change the password like mentioned above

You can read more about the grub hack over here http://smalltutorial.com/hack-grub-login-root-without-password or a simple google search would give you tons of results

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You don't need sudo when you are already running as root in the chroot, and you don't need to muck about with the command line arguments to get a root shell; it's right there on the rescue menu. –  psusi Dec 19 '12 at 3:36
    
yeah correct :) must have missed it out –  Mevin Babu Dec 19 '12 at 3:37

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