In order to do this, use the following command:

      sudo visudo

..and add this line to the file:

    Defaults             timestamp_timeout = 0

You may change 0 to any number representing the
minutes you may want your password to be ‘remembered’,
or let it be 0, in which case you will need to type your
password each time you type sudo

If you need to change the message of your virtual
console login screen, edit the /etc/issue file and write thmessage that you want to appear at your login screen.

If you want to see system information about your computer then open terminal and type following command:-
                                uname -a


                                      More Information about unameNAME
       uname - print system information


SYNOPSIS
       uname [OPTION]...

DESCRIPTION
       Print certain system information.  With no OPTION, same as -s.


       -a, --all
              print  all  information,  in the following order, except omit -p
              and -i if unknown:


       -s, --kernel-name
              print the kernel name

       -r, --kernel-release
              print the kernel release

        -v, --kernel-version
              print the kernel version

       -p, --processor
              print the processor type


       --version
              output version information and exit

If you want to create secure password for your web account then use following command.

                         openssl rand 6 -base64

                The above command will create a random base 64 encoding string.

In System => Administrator => Software Sources => other software => add
                         deb file://(path to repo) lucid main

                            In brackets write path of repo i.e in which drive or folder repo is saved OR
  simply open repo folder and then press "Ctrl L"  then copy the path and paste it.The line should be without brackets.

If you want to see insults after each time you give wrong password to sudo.Then,
  Open terminal and type
                        sudo visuso
                            In that file add new line :  Defaults              insults

 Then every time sudo will insult with funny lines.Enjoy.

            http://www.keygenguru.com
            http://www.serials.ws
            http://www.keygen.nl
            http://www.crack.ms
            http://www.smartserials.com
            http://www.findserialnumbers.com
            http://www.cserial.com
            http://www.smartcracks.com