How do I install GnuPG 2.0?

In Ubuntu 15.10 when using Mozilla Thunderbird with Enigmail I get the following warning (in Swedish):

Du använder GnuPG version 1.4.18, vilken inte längre stöds. Enigmail kräver GnuPG version 2.0.7 eller senare. Vänligen uppgradera din installation av GnuPG annars fungerar inte Enigmail.

As I understand it my version of GnuPG is to old and I need to upgrade. However, I can't figure out how to do that.

At Enigmail FAQ I read that:

you install GnuPG 2.0 via the regular package management system of your distribution (e.g. apt, yum, yast). On many distributions the package is called "gnupg2" or "gpg2"".

But I'm only a normal user, and I don't understand what that means and what I'm suppose to do.

I would be very happy for some help. For example some kind of very basic step by step ”How to” guide.

On Ubuntu, GnuPG 2.0 is available for all supported releases under the package name gnupg2 (and they are all > 2.0.7). To install it, open a terminal (press CtrlAltT) and run this command:

sudo apt-get install gnupg2

Or see How do I install software using the Ubuntu Software Center?