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@Artificial Intelligence: Thanks for your efforts but that does not work either. On other forums I found that issues like this one can be related...
sudo sh /usr/share/applications/xampp.desktop ...makes the XAMPP manager start/launch but executing the command as ordinary user does not work...
I'm a complete noob to elementary (though not to Linux) and would like to create a launcher for the XAMPP managing app. The .run file is located...