cannot open the pdf application in emulator

i am quite new to android. I tried running an application downloaded from web on my emulator but it failed.

I am using Linux(ubuntu). I first of all pasted the .apk file in tools folder of android_sdk.
then I tried the following things on terminal:-

export PATH=$PATH:/home/user1/Downloads/android-sdk-linux_86/tools
sudo apt-get install adb pdfview2.apk

It gave the following errors:-
E: Unable to locate package adb
E: Unable to locate package pdfview2.apk
E: Couldn't find any package by regex 'pdfview2.apk'

I launched my emulator from the tools folder itself...

sudo apt-get install adb pdfview2.apk

What do you think this line should do?

i followed the steps as given at http://blog.freewarelovers.com/2010/08/how-to-install-apk-files-on-android.html
In ubuntu ,we need to use apt-get command
please help me.i am newbie to linux too.

In ubuntu ,we need to use apt-get command

No, and that article doesn't even mention it. Rather, it talks about "adb install ...".

Note that "adb install ..." only works if either the emulator is running, or an Android device is connected via USB.