Download and extract PhpMyAdmin

Code:
cd ~/www
wget http://downloads.sourceforge.net/project/phpmyadmin/phpMyAdmin/4.2.11/phpMyAdmin-4.2.11-english.tar.gz
tar zxvf phpMyAdmin-4.2.11-english.tar.gz
mv phpMyAdmin-4.2.11-english phpmyadmin
cd phpmyadmin
cp config.sample.inc.php config.inc.php
Create Apache Configuration file.

Code:
sudo subl /etc/apache2/sites-available/phpmyadmin.conf
Add following code and save.

Code:
Alias /phpmyadmin "/home/USERNAME/www/phpmyadmin"

<Directory "/home/USERNAME/www/phpmyadmin">
    AllowOverride All
    Require all granted
    Options FollowSymlinks
    Order allow,deny
    Allow from all
</Directory>
Now run

Code:
sudo a2ensite phpmyadmin
sudo service apache2 restart