I follow this tutorial and i can't find phpmyadmin.conf for step two of this tutorial. i have only below files in /etc/apache2/conf-available/
I have to to edit which one?
Are you sure you followed this correctly?
When the first prompt appears, apache2 is highlighted, but not selected. If you do not hit "SPACE" to select Apache, the installer will not move the necessary files during installation. Hit "SPACE", "TAB", and then "ENTER" to select Apache.
This is a very important part of step one that i've overlooked before that can cause this problem
As another remedy you could try this:
From the docs: https://help.ubuntu.com/community/phpMyAdmin
If this does not work, then you can do the following to include the phpMyAdmin-shipped Apache configuration into Apache:
sudo ln -s /etc/phpmyadmin/apache.conf /etc/apache2/conf.d/phpmyadmin.conf sudo /etc/init.d/apache2 reload
Since Ubuntu 13.10 (Saucy Salamander), Apache no longer loads configuration files from the /etc/apache2/conf.d directory. Instead, they are placed in the /etc/apache2/conf-available directory which is managed with the a2enconf command. Therefore, if you need to manually include the phpMyAdmin-shipped Apache configuration file, you must run the following:
sudo ln -s /etc/phpmyadmin/apache.conf /etc/apache2/conf-available/phpmyadmin.conf sudo a2enconf phpmyadmin sudo /etc/init.d/apache2 reload