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i am trying to set a new password for linux Ubuntu 12.04,but on running command
its giving something like this

$passwd Changing password for ubuntu. (current) UNIX password: Enter new UNIX password: Retype new UNIX password: Bad: new password is too simple Enter new UNIX password:

i really don't understand why this is so....?

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3 Answers 3

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Password complexity rules are generally enforced by PAM. You have two options:

  • Use a "complex" (by PAM's definition) password;
  • Change the password simplicity rules as part of pam_cracklib.so in /etc/pam.d/system-auth, or equivalent.

See man 8 pam_cracklib for information about the available options.

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  • there is nothing like system-auth in /etc/pam.d/system-auth and there is no man page entry for pam_cracklib Commented Nov 11, 2013 at 6:35
  • Is root allowed to set the passwords of other users and override the check? Part of me thinks it can, but it's been a while, and none of my systems use pam_cracklib to test. Commented Nov 11, 2013 at 13:11
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An installation of Ubuntu requires a minimum password length of 8 characters. (This was changed a few years ago, but I think they kept the installer with a shorter password length to make it easier to setup a user during installation).

With superuser or root privileges, you need to edit a file called /etc/pam.d/common-password.

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  • how should i edited this /etc/pam.d/common-password so that it can accept the password which is being acceptable by the same platform like other systems. Commented Nov 11, 2013 at 11:50
  • Sorry Ayush Joshi for late reply. Just check out these links, will surely help you out. blog.subaquatic.net/archives/… askubuntu.com/questions/113682/… Commented Nov 15, 2013 at 7:13
  • No problem....actually i also completely forgot about my own question but your suggestion is really helpful & got the solution for this.............. Thanks Much Adi... Commented Nov 15, 2013 at 12:22
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Solution for this we have to edit this file /etc/pam.d/common-password & we have to done changes like this password 

 [success=1 default=ignore] pam_unix.so minlen=1 sha512
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