We have around 250 desktops where we have installed Linux Ubuntu 10.04, now the problem is that the Mozilla Firefox version in Ubuntu is 3.6 and the application we are using does not work correctly unless the firefox version is higher then 5.0, I have tried many times to upgrade the version but failed. So I would like to know the actual process of how to do the upgrade, I am not familiar with linux which has increased my problems. Please suggest