fix The requested URL /phpmyadmin was not found on this server

After installing phpmyadmin by using the command:

sudo apt-get install phpmyadmin

you may face the problem that cannot access phpmyadmin.

Not Found
The requested URL /phpmyadmin was not found on this server.
Apache/2.2.22 (Ubuntu) Server at localhost Port 80

Let's check apache2 config file:

sudo nano /etc/apache2/apache2.conf 

and search insert:

Include /etc/phpmyadmin/apache.conf 

at the bottom of file. and restart apache2

sudo /etc/init.d/apache2 restart