How to upgrade MediaWiki to 1.40 version
Link to page for web updating - your_site_url/mw-config/index.php
If your version older then 1.35 version, then firstly update to 1.35 version. Only after that update to 1.40 version. Otherwise, it can brake you data in DB.
If you see 500 error after updating - check permissions for folders: cache, vendor, skins, includes. For changing permission use command:
chmod -R 777 ./cache
If you see another errors on the pages, try to update extensions.
To fix Logo after updating: need to change $wgLogo to $wgLogos.
Before: $wgLogo = "$wgScriptPath/resources/assets/logo.png";
After: $wgLogos = [
'1x' => "$wgScriptPath/resources/assets/logo.png",
'1.5x' => "$wgScriptPath/resources/assets/logo.png",
'2x' => "$wgScriptPath/resources/assets/logo.png",
'svg' => "$wgScriptPath/resources/assets/logo.png"
];
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