I'm looking for a solution for this issue. thewismit posted that the extension manager doesn't give any search results (in the third tab) whatsoever, same happens to me.
I already checked all permissions on folders and files on different devices (it's installed on a synology NAS and a "normal" Ubuntu server), all with the same result. Surely I'm logged in with a user with superuser rights, so that shouldn't be the issue. I even did a fresh install of dokuwiki in another folder, set the permissions and it doesn't work there either.
At the moment plugins/extension can only be installed by copying them into the plugin folder (which works fine), but that's not the way it's supposed to work, I guess, right?
Thanks for your help in advance