Looking online the general recommendation seems to be to install moodle yourself and avoid the debian package version. While not a stranger to rolling my own, I just want to play with moodle for learning purposes because that's what my uni uses.
sudo apt-get install moodle
Once it's installed, look at
If there's nothing moodly, then do
sudo cp /etc/moodle/apache2.conf /etc/apache2/sites-enabled/moodle.conf
sudo service apache2 restart
Navigate to http://localhost/moodle
The actual installation takes ages, so go get yourself a cup of tea/coffee to prevent your mouse finger from getting itchy. In other words, just wait until you get a list showing that all steps have completed and that you may continue.
You need to allow cookies.
Fill out the admin stuff - country, password, city etc etc.
At this point you can log in, create a class and start exploring. Have fun.