Unable to update WordPress or install plugins/themes

I’ve seen this happen when WP doesn’t like the file owner. Can you change it to www-data and check file permissions? https://codex.wordpress.org/Changing_File_Permissions

Or it could be that WordPress is getting confused by your /content folder, which is normally /wp-content. Have you defined WP_CONTENT_URL in wp-config.php? http://www.hongkiat.com/blog/renaming-wordpress-wp-content-folder/

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