'Alt'+'Shift' problems on GNOME3 (Ubuntu 18.04+) [duplicate]
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This question already has an answer here:
Ubuntu 17.10, changing input switching to alt-shift (with gnome-tweaks) creates problem in firefox
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OS keyboard shortcuts conflict with apps keyboard shortcuts in GNOME 3
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I want to use Alt + Shift as keyboard layout switcher. The main configuration utility doesn't allow me to do that (it's a default switcher for almost all computer users). Ok, no problem, I can setup it in GNOME Tweak Tool. But when I press Alt + Shift in e.g. Firefox, it shows me hidden main menu (like if I press single Alt ). How can I fix it and make Alt + Shift combination work ...