How to Change Document root folder in LAMP to a mounted location (Ubuntu)

I need to change the document root in LAMP, I use Ubuntu 15.

Since I want to have the same www folder for Linux as I have in Windows, I'll be using a mounted location.

To achieve that I ran the following command in Terminal (ALT+SHIFT+T -> to open Terminal):
sudo nano /etc/apache2/apache2.conf

Inside the editor I added the following code to the file:

<Directory /media/my_user_name/WORK/www/>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
</Directory>

Then I ran sudo nano /etc/apache2/sites-available/000-default.conf and edited the line containing DocumentRoot to:

DocumentRoot /media/my_user_name/WORK/www

In the end I run sudo service apache2 restart

Now everytime I access localhost I get the following error:

Forbidden

You don't have permission to access / on this server.
Apache/2.4.12 (Ubuntu) Server at localhost Port 80

Solution

Looks like I was missing 3 more steps:
1. As suggested by @Ferendevelop I should set permission to 755 running:

   sudo chmod 755 /media/my_user_name/WORK/www/

2 Do a chmod +x on the user dir by running:

   cd /media/
   sudo chmod +x my_user_name

3 Restart Apache2 service by running:

   sudo service apache2 restart

Now it works!

PS: Thanks!