For users of Ubuntu, it might be easiest to install the pre-built packages for Diana and other software from MET Norway from the MET Norway metapps PPA.
General installation instructions are given under Adding this PPA to your system and Read about installing.
You need to be able to run the sudo command to be able to install Diana packages (or any other packages).
sudo apt-get install python-software-properties sudo apt-add-repository ppa:met-norway/fimex sudo apt-add-repository ppa:met-norway/metapps sudo apt-get update
sudo apt-get install diana-3.50 ...
The version numbers might, of course, change over time.
Assuming that you installed diana-3.50, you might want to test that Diana is installed correctly by running it:
diana.bin-3.50 -s /etc/diana/3.50/diana.setup
Now you need to configure Diana for your workstation by editing/writing a diana.setup file.