Install LAMP on Ubuntu 13.10

Open the terminal, then run

sudo apt-get install lamp-server^

^ sign is a Tasksel command (https://help.ubuntu.com/community/Tasksel)

Now, let's make a new php file to test.
Firstly, I'm going to open a text editor called gedit as a root user.

Press Alt + F2, then run

gksudo gedit

Note: if gksudo is not installed, you can install it using

sudo apt-get install gksu

Then type this php code

<?php
phpinfo();
?>

And save it in /var/www/ folder. I use "phpinfo.php" as the file name.
Now, open it in web browser: http:/localhost/phpinfo.php
You should be able to see the output of phpinfo().
LAMP server installation is done.
References:
Source: http://gregrickaby.com/how-to-install-lamp-on-ubuntu/