You want to install any plugin, but *blink* – WordPress need your FTP credentials. What the hell? The problem is simple – whenever you use WordPress to install, upgrade, or delete plugins, WordPress must make changes to files on the filesystem.
If WordPress does not have the necessary permissions to modify the filesystem directly, you will be asked for FTP credentials so that WordPress can try to do what it needs to via FTP.”
How to fix this problem? Open the wp-config.php file of your WordPress installation folder. Copy the below code and paste it at the wp-config.php file.
FS_METHOD works in some cases. WordPress tries to create a file ‘wp-content/temp-write-test-‘.time(). If this fails it assumes that you can only use FTP. But this might not be true if the wp-content folder itself is not writable, but for example, the folder wp-content/plugins is.
So the FS_METHOD method will probably work but the problem can be after unpacking the package. If the error says: “Could not create directory.”, you must set chmod 755 to the wp-content folder.
Total Commander: Files > Change attributes > Set 755
Ubuntu: sudo chown -R www-data:www-data PATH_TO_WORDPRESS_FOLDER
Does it work for you? Write in the comments!