WordPress ubuntu http to https redirect

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteCond %{HTTP:X-Forwarded-Proto} =http
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]


RewriteRule ^wp-admin/includes/ - [F,L]
RewriteRule !^wp-includes/ - [S=3]
RewriteRule ^wp-includes/[^/]+\.php$ - [F,L]
RewriteRule ^wp-includes/js/tinymce/langs/.+\.php - [F,L]
RewriteRule ^wp-includes/theme-compat/ - [F,L]
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

</IfModule>
# END WordPress
Options All -Indexes

If you don’t want to change anything on .htaccess you may try this out

add_action('template_redirect', 'redirect_core', 50);
add_action('init', 'redirect_core', 50);
add_action('wp_loaded', 'redirect_core', 50);
function redirect_core(){
  if (!is_ssl()) {
    wp_redirect('https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 301);
    exit();
  }
}

Source: https://www.liquidweb.com/kb/troubleshooting-too-many-redirects/