July 10, 2012, 4:23 PM — Here's how you can disable the annoying popup that appears while running scripts in Ubuntu or Linux Mint.
1. Open Nautilus.
2. Go to Edit.
3. Go to Preferences.
4. Go to the Behavior tab.
5. Click the "Run executable text files when they are opened" option, listed under Executable Text Files.
For more, see the original article at the link below.
Disable popup window when running scripts in Ubuntu / Linux Mint | Linux and Life