[stakanov]

I do not know if you use gnome or kde, but it seems gnome. There should be a viewer in gnome.
Substantially there is a mountain high of viewers available. It is your choide if you install them or not.
Kpdf comes with kde and works very well, if you use 3.5. If you use a 4.x version you have the very powerful "Okular".
If you have the "non oss" repository activated it takes a click to install Acrobat Reader. Although the program appears heavy and less well programmed the the opensource versions, it comes still with the same interface as the windows version.
One remark, this is really a question that appears to indicate that you did not even look at your program folders. Generally it helps to right click on a file and choose Open with...... to see the currently associated programs with that kind of file.
That should be fairly easy now.