I have already deleted the entry for F11-fullscreen from ~/.config/openbox/lubuntu-rc.xml

even after a reboot, the F11 fullscreen functionality remains, and I can't use F11 in other applications as the key press is intercepted.

  • Are those applications system applications like terminal or nautilus? Because removing F11 binding from lxde-rc.xml seems to work for me and I can use that key in Eclipse. However it still works as full screen for system apps. These may be because these applications themselves listen for F11 and switch to full screen. Thus you may need to edit the config for these individual applications aswell. – Kshitiz Sharma Feb 12 '15 at 5:26

I think just deleting the lines for F11 may not serve the purpose.

You need to replace the contents after action name= to nothing.

So, change action name="ToggleFullscreen" to action name="", save the file, and then run openbox --reconfigure in a terminal. There should be no error message if your lubuntu-rc.xml is in good condition! There's no need to reboot. Now, F11 should have no effect as far as Openbox is concerned.

I don't know about your other programs which also want to use F11 for something else. For example, both Firefox and Google Chrome will still use F11 to toggle full screen. On the other hand, F11 in LibreOffice will now function to open the "Style and Formatting" panel.

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