how do i install other softwares

I hope this link answers your questions:
http://ubuntuguide.org/wiki/Ubuntu:Feisty
and for installing gta san andreas etc you need to install wine and check this link out for your game compatibility with wine..
http://appdb.winehq.org/
Bhavani Shankar.

Hi nii nai !:-)

actually , you are now on a linux platform , not windows !.

so all those windows APPS / games are not supposed to work !

so here is a soloution.

There is an app called Wine http://www.winehq.org/

This program is supposed to run your windows Applications on linux !

you can easily download it / install it in a single command in your terminal !

to do that follow those steps:
open your terminal by clicking applications -> Accessories -> Terminal

then when your terminal opens, type in :

sudo apt-get install wine

it should ask for your password, type it in . Notice that it won't show the '*' while you type, but just type in normally ! this is how it works to avoid people from looking over your shoulder !:-)

after the apt gets your program and installs it, you can close the terminal either by typing exit, or clicking the X button !

now it's time to run your Wine !

click on applications -> accessories -> winefile

This will show you something like the old "winfile" !

simply browse to your setup .exe for your pgoram !:-), and do everything like you did it on windows !

this can run many windows APPS and some games, but for newer games like "NFS carbon" and similar games, you need another app.

it's called Cedega.
I didn't really read about it, but you can do that easily , here's the page about it : http://www.transgaming.com/products/cedega/6.0/

get it, and try to install it, if you've got troubles and didn't find a solution just come back here and tell us about it !
I'll be glad to help you !:-)

hope you enjoy linux !:-)