https://askubuntu.com/questions/18747...
Graphical Method
Right click on the file in the file manager and click 'Properties'. Click the 'Permissions' tab and tick the box that says 'Allow executing file as program'.
Double click the file to execute it.
If this method doesn't work, try using the terminal method.
Terminal Method
Assume the file is called some-app.run and is in the folder /home/user/Downloads. You will need to modify these instructions to fit your situation.
Open a terminal (Applications-Accessories-Terminal).
enter cd /home/user/Downloads
enter chmod +x some-app.run
enter ./some-app.run
if step 4 fails with a message including 'permission denied', try entering sudo ./some-app.run (you will need to enter your password for this).
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