Nowadays, i have been fixed an issue about installing theme or plugins directly into our server with vsftpd .
Just following these instruction then you can solve it.
– I presumed that you have implemented vsftpd or another ftp service correctly.
– make sure that you have proper owner and permission on wp-content/uploads or wp-content/theme .
– add this line into your wp-config.php file => define(‘FS_METHOD’,’direct‘);
Just like that 🙂
But sorry i can’t give you screenshot