After a clean install of Ubuntu 18.04, my left ALT doesn't work properly. It can be used for switching windows with L-ALT+TAB, but any normal hotkeys like L-ALT+F4 or PyCharm bindings that start from L-ALT don't work (but when that ALT bind is somewhere in the middle - everything's all right).
Also, in the System Settings > Keybindings menu, I can't change any default shortcuts: when I click on a shortcut, nothing happens, but I still can add my own. The window for changing shortcuts works normally and reset all kind of works, too, but give no desirable changes.
I created a new user and on that account, everything works well.
I tried to play with setxkbmap and stuff like
dpkg-reconfigure keyboard-configuration
to set everything to default, but still Left-ALT is just causing windows to move out of focus or show their window context menu (after who knows what manipulations in GNOME Tweaks/dconf-editor)
So, I just want a way to set everything to its default value.
But there is definitely some bug at work, if the shortcuts configuration menu doesn't work...
