title: WordPress doesn't activate or deactivate plugins
body: <p>for some reason my WordPress website isn't able to activate or deactivate plugins. 
  On clicking the activate/deactivate option it will output the plugin activated/deactivated text but it never actually changes anything. There is no error message or so being displayed.</p>
  
  <p>The WordPress installation is fully updated and I have no idea what is causing this.</p>