Added Linux specific descriptions

cmd.md

@@ -65,7 +65,7 @@ Ok, now you're a cool hacker who can use the terminal (or "console") to write in
 
 <div id="tab-linux" class="content">
 
-Open up the application on your computer called “Terminal” by tapping the SUPER key (Windows or Apple key, depending on your hardware) and typing “Terminal”.
+Open up the application on your computer called “Terminal” by either pressing __Control + Alt + T__ or  by clicking the symbol at the top of the Ubuntu launcher and searching for "Terminal".
 
 Its icon looks like ![](http://i.imgur.com/y5U2cZ2.png), and the terminal will look something like ![](http://i.imgur.com/6jzen4Y.png?1)