use the Mozilla Developer Network HTML reference  to identify and use basic HTML tags
translate HTML tags like <div>, <p> into real world structures
Good work. The only problem I see is with your <img> tag. You have <img src="ubuntu.jpg"> </img src> and this is incorrect. The img tag doesn't need an opening and closing tag and is self closing like so: <img src="ubuntu.jpg />. Other than that it looks good.