This post explains how to install and configure phpmyadmin on ubuntu or debian systems.
Install phpmyadmin using apt-get
#apt-get install phpmyadmin
Copy the phpmyadmin apache configuration file to /etc/apache2/conf.d/
#cp /etc/phpmyadmin/apache.conf /etc/apache2/conf.d/
Or
You can include the configuration file in apache2.conf by adding this line to it
Include /etc/phpmyadmin/apache.conf
No restart apache
#/etc/init.d/apache2 restart
Sometimes you may have to add a blowfish secret to accept cookies.
#vi /var/lib/phpmyadmin/blowfish_secret.inc.php
$cfg['blowfish_secret'] = 'a8b7dafdferHJHJ^&U^45776TIUuiYc6d';