I installed Ubuntu 16.04 on a former Windows 8.1 laptop (from a USB drive), and I am trying to install XAMPP on it. I put the .run file I downloaded on a SD card (I can't get wifi on the laptop) and moved it to my downloads folder. However, the system is showing it as a text file. I tried sudo chmod +x xampp.run, which worked (it became executable), but when I tried running it: sudo xampp.run, I got a lot of "question mark" icons. The system tried reading it out in the Terminal, instead of opening it. Why isn't this working? It worked on both previous versions I've used (14.04 and 15.10).