turning on debug mode

Turn debug mode on

edit your wp-config.php file and find

define('WP_DEBUG', false);

change to

define('WP_DEBUG', true);


General causes of bugs

1. Dodgy plugins/templates. Remove them all and add them back one at a time. Same for themes
2. Config errors. Replace the config.php file with the template and reinstate it. Obviously copy/paste the login details for the database out before you do that, so when you recreate it, it asks for them again.
3. Code incompatibilities. You have some old code somewhere (e.g. an old php file) which was not upgraded and is now incompatible with the new php in the new issue of wordpress/plugin/template etc
4. Permission errors. 

chmod -R 755 /var/www/mysite
chown -R www-data:www-data /var/www/mysite

assuming your installation is located in /var/www/mysite.

On a single-site server it will be /var/www/html

"There has been a critical error on your website" = problem 3 above, usually.

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