[ubuntu] Problem of Installing Apache2 With PHP5 And MySQL Support On Ubuntu 12.04 LTS (LAMP)

I've tried to install Lamp or Localhost server on ubuntu 12.04 LTS from http://www.howtoforge.com/installing...12.04-lts-lamp

The below code must open a new document file with gEdit/Test editor
But with this command opened a new document file on Terminal on my pc. Why don't it open with geditor/text editor??

I need to open it on gEditor to to complete the installation of Lamp.

Please help me about it :( :(