Which Linux distribution is better for newbies?

Its better to install Linux Mint since a lot of documentation and help for newbie's is available with ubuntu. After sometime he may start working with terminal gradually.

Given that you're going to install Linux, I would go with Gnome. KDE is for people who want to tweak this, adjust that, and configure another thing, until it fits them like a glove. Gnome, IMO, is for people who want it to just do its job, because dagnabit, they've got work to do.

Linux Mint 9 LXDE would be my suggestion for newbies, due primarily to the existing support (as sashi notes) and the quickness and simplicity of the desktop environment. Peppermint is another good one for laptops, especially.

Ubuntu 10.04 is a good distro for new users. It has all the power, admins require and easy enough for newbies.

I agree with teddymills, Ubuntu is the best for newbies.

I suggest you install for them LinuxMint.

check out ZorinOS (http://www.zorin-os.webs.com/ ) it is a Ubuntu based distro.

From the website:

"Zorin OS is a multi-functional operating system designed specifically for Linux newcomers who want to have easy and smooth access to open source software. It is based on Ubuntu which is the most popular Linux operating system in the world."

I have tested it and have found quite polished and complete. also, the Gnome desktop has been tweaked to offer a familiar experience to windows users and computer "newbies"

In my opinion, Ubuntu desktop (or laptop depending on your platform) is really hard to beat. I've installed it for my mother who is in her 80's and she finds it "pretty easy" to use - as well as pretty solid. I'm not putting down the other distros, simply saying that Ubuntu really does a nice job for users - there is a significant Ubuntu community willing to help, and as Canonical has demonstrated, they continue to develop and upgrade their offering. You would not be making a mistake with Ubuntu.

i would suggest Linux mint isadora.you can try it first on virtual box check out this link plz (http://myit-solutions.blogspot.com/2010/09/linux-mint-isadora-on-virtual-box.html).