Which version of Ubuntu should I install?

Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs

Hello manish!

All versions of Ubuntu are great but I recommend you to use the latest stable version (Gutsy Gibbon). You can download it from http://www.ubuntu.com/getubuntu/download

Iulian: note that he already asked "which version of 7.10 is better"; 7.10 is the same as Gutsy Gibbon. I'll use "flavour" to distinguish between versions of Ubuntu (6.06, 6.10, 7.04, 7.10, etc.) and the different CD images we ship for each version (Ubuntu desktop, Kubuntu desktop, server, etc.).

manish: It really doesn't matter much, as you can install whatever packages you turn out to need for your specific goals on top of any flavour of Ubuntu. You probably ought to install the flavour that will let you use it for regular work as well. For example, if you're planning to use the laptop as an ordinary desktop system as well, then install the desktop flavour. If it's a special-purpose machine that's going to be sitting to the side of your desk and used remotely while you're actually typing on some other machine, then you might want to install the server flavour.