WordPress ERR_EMPTY_RESPONSE when trying to update

Try downloading WordPress again, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel, and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings.
Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.

Issue fixed. Problem was caused by too restrictive file ownership (owner being root instead of www-data).

Great ??

Hi!

Can you please provide some steps on how you fixed it?

@sajeedlakhani.,

Can you please share your link