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password recovery
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Mukesh Prajapati
Greenhorn
Joined: Feb 02, 2011
Posts: 10
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hello Ranchers how are you? I am new on ubuntu linux 10.10 version.I have my ubuntu password can you explain me hoe to recover my linux password .please
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Andrew Monkhouse
author and jackaroo
Marshal Commander
Joined: Mar 28, 2003
Posts: 9982
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Can you please explain what you are trying to do? If you have your Ubuntu password, then you have a Linux password (Ubuntu is a flavor of linux).
Most systems are designed so that passwords are not recoverable. However it may be possible to set a brand new password on an account.
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Tim Holloway
Saloon Keeper
Joined: Jun 25, 2001
Posts: 12513
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The standard password configuration for virtually all modern-day Linux distros uses a one-way encryption scheme.
In other words, when you login, it does not decrypt the password stored in /etc/passwd (or more usually /etc/shadow). Instead, it encrypts the password you typed in and compares it to the encrypted password in /etc/passwd or /etc/shadow. Because the algorithm being used is encrypt-only (no decryption), you cannot recover a lost password. About as close as you can get is to mount a dictionary attack, and Linux also has provisions in it to make dictionary attacks as inconvenient as possible, since Bad People would otherwise use that method to break in.
So rather than recovering a password, what you need to do is reset the password to a known value. That has to be done by the system administrator.
If you lose the root password, that's a bigger problem, since you need to be logged in as root in order to issue the passwd command in most cases. To recover from that problem, you'd have to shutdown the machine, boot up into single-user mode (which doesn't require a login) and reset the root password. Then reboot into the normal operating runlevel.
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One of the most odious afflictions that Business has inflicted on the modern English language is "pro-active". Most of the time it's simply redundantly used in place of the simple old word "active". And a good deal of the rest of the time it means "You're not overworked enough yet, so go out and find more!"
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Stefan Wagner
Ranch Hand
Joined: Jun 02, 2003
Posts: 1920
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Tim Holloway wrote:If you lose the root password, that's a bigger problem, since you need to be logged in as root in order to issue the passwd command in most cases. To recover from that problem, you'd have to shutdown the machine, boot up into single-user mode (which doesn't require a login) and reset the root password. Then reboot into the normal operating runlevel.
On ubuntu, there is no root login by default. All you do you do as user via sudo, and for sudo you need your own password.
However, you're right in the advice to do a (S)uperuser boot. You do it by booting from grub an entry, marked as ... (recovery mode)
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subject: password recovery
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