I am getting
The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.: wp-includes/js/mediaelement/bigplay.png, wp-includes/js/mediaelement/background.png, wp-includes/js/mediaelement/controls.png, wp-includes/images/admin-bar-sprite-2x.png, wp-includes/images/admin-bar-sprite.png, wp-includes/images/wpicons-2x.png
Installation Failed
error while upgrading Wordpress Version. How can I fix this?=