Doesn't work in Linux Environment

[eluser]Unknown[/eluser]
Hi everybody, I'm studying CI with Professional CodeIgnite(Wrox press). I ald finished some chapter it's work great in my Window environment but not in my Linux Environment.

When i browse this tutorial in Window it's work every clickable link. But not in linux just only work when i browse tutorial. When i click other menu/product/ or something it show Object Not found error. How can i fix it? :confuse: