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Some xkb mappings have the non-breaking space assigned to a combination of key (for instance AltGr-Space or AltGr-Shift-Space). Some compose database also have a mapping (Compose space space for instance). You may be hitting one of those involuntarily.


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Indeed, Geany is having an option to insert an alternative space. You can find the option inside the "Insert" menu and/or you can set a keybidng for it (inside the insert section of keybedings). In default there should be no keybinding set for.


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As others have mentioned it's likely to a specific service or process, which you should be able to kill. You can start gnome-system-monitor as root to see all of the processes on the system and their CPU load. Instead of rebooting next time try a few things: Use the CTRL+ALT+F1 through F7 to switch to another terminal. This will cause your X graphics ...


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IMO, You need to identify the service which you want to restart(use "top" command for the same). You will have to be cautious while choosing a service to restart. For an ex: top will also list "firefox" so you should refrain from killing it as you do not want to close it.



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