On Mon, Dec 28, 2020 at 2:31 PM Noob <mediawiki_noob_20201228@ito.in-berlin.de> wrote:
The errors are:
PHP Parse error:  syntax error, unexpected 'public' (T_PUBLIC), expecting end of
file in /etc/mediawiki/LocalSettings.php on line 186

I think "public static function" goes inside classes, and in LocalSettings.php just "function" might work. That gets rid of the error, but I haven't upgraded to 1.35 so can't check whether the code works.
PHP Fatal error:  Uncaught Error: Class 'WebRequest' not found in
/usr/share/mediawiki/includes/HeaderCallback.php:63\nStack trace:\n#0 [internal
function]: MediaWiki\\HeaderCallback::callback()\n#1 {main}\n  thrown in
/usr/share/mediawiki/includes/HeaderCallback.php on line 63

This might disappear when the other error does but the same error appeared here: https://www.mediawiki.org/wiki/Topic:W02ztr7ierd0ff9l

Best wishes