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If You just installed Ubuntu and forgot what password you selected during the installation process or one of your friend gave you ubuntu computer without giving username and password.This tutorial will help you to recover username and password
One of the biggest security holes you could open on your server is to allow directly logging in as root through ssh, because any cracker can attempt to brute force your root password and potentially get access to your system if they can figure out your password.
Ubuntu Tweak 0.5.4 was released today. It doesn't come with new major features except an option to customize the GDM (login screen), which you can use to change the login screen background, logo, disable the user list, disable the login sound and disable showing the restart buttons:
If for whatever reason you stop using a certain service in your Ubuntu install and would like to disable automatic restarting for it upon system reboot, all it takes to do it is just one command line.
By default, Linux Mint 12 ships with a guest session enabled, so a password-less access to the system is possible from the login screen to anybody with physical access to a Linux Mint 12-powered computer. If you do not want that level of openness on your computer, this tutorial will show you how to disable that guest session, and also how to create additional user accounts on the system.
I found a really quick fix today for disabling ipv6 completely on Ubuntu 7.10 (not yet tested on previous versions). This might be of interest to some of you that have had networking problems, as I’ve heard disabling ipv6 at least within the browser has been a help here. This tutorial will disable ipv6 completely on the machine.
You can Change your User Password and Profile easily in Ubuntu.
Now You will get a screen as Below. At right top corner you can select change password and change your password
