I installed UBUNTU 12.04 LTS today. I had kept my password as "1317kmb".On restarting and updating it asks for password. when i use the above mentioned password, it does not accepts. I don't know why? How can I reset password. All my enthusiasm of using UBUNTU has been lost by this.
Open a Terminal window or access the prompt from your grub menu (see https://help.ubuntu.com/community/LostPassword) and type in
Enter your password at the prompt and follow the on-screen instructions
Please Note When you enter your password and confirm it, nothing is displayed on the screen... It's not your keyboard!