Its easy to install phpmyadmin in normal case but in some case you have to go through the following command.

For normal case

sudo apt-get install phpmyadmin

but in some cases although the installation is successful, you can’t access phpmyadmin panel by localhost/phpmyadmin on browser. For that case just add one line below in apache2.conf file.

gksu gedit /etc/apache2/apache2.conf

Then add the following line to the end of the file.

Include /etc/phpmyadmin/apache.conf

Then restart apache

/etc/init.d/apache2 restart

Enjoy!