Digitalocean: WordPress Update, Install Plugins & Themes not working asking for FTP details

If you are running your website on digitalocean and getting error while updating or installing new wordpress plugins and themes then this solution will help you to solve this problem.

I solved this issue by doing following two steps

1] Step 1

First login to your droplet using terminal. And run following command

sudo chown -R www-data:www-data /var/www

2] Step 2

After that you have to add following line of code inside wp-config.php

define('FS_METHOD', 'direct');

It will stop asking for FTP login details. And you can install or update existing plugin themes or wordpress easily.