Help with LAMP sever
Try editing apache2.conf or httpd.conf
sudo nano /etc/apache2/apache2.conf
Make sure you have there
include /etc/phpmyadmin/apache.conf
alias /phpmyadmin /usr/share/phpmyadmin
And that they are uncommented. I am not sure about the paths. 1st one will include phpmyadmin config file. 2nd will make phpmyadmin available on 127.0.0.1/phpmyadmin. I'd have to see those config files. Try different things restarting apache on each change:
sudo service apache2 restart