లినక్స్ లో మొబైల్ మోడెంతో ఇంటెర్నెట్

i am using reliance wire less net connect for windows.
I also using Linux ubuntu(9.04) latest version.
i tried the above commands in terminal, but it is not working. It shows as the following:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
home@ubuntu:~$ sudo passwd root
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
home@ubuntu:~$ su -
Password:
root@ubuntu:~# wvdialconf
The program 'wvdialconf' is currently not installed. You can install it by typing:
apt-get install wvdial
-su: wvdialconf: command not found
root@ubuntu:~# apt-get install wvdial
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package wvdial is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package wvdial has no installation candidate
root@ubuntu:~# -su: wvdialconf: command not found
-su: -su:: command not found
root@ubuntu:~#
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
please help me...
i want to use net in linux.

i tried the above link sent by you.
There is no use, same problem is repeated.
please help me.

నిఖిల్ గారు..గవేష్ గారి సూచన తప్పక పని చేయాలి. చేయకపోతే తెలుపగలరు.