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I have a problem that when I'm pressing Alt+Shift (both right and left) Ubuntu changes the language...
I want to disable the shortcut of changing a language in my Ubuntu 18.04.2 LTS , but I don't see it in the shortcuts panel...
I only see super+space (in the picture 'Switch to next input source') ...
Since this is actually performed by iBus, suggest you check to make sure ibus-daemon is running. If it is not, run ibus-daemon to start ibus daemon:
$ ps -ef | grep ibus
$ /usr/bin/ibus-daemon --xim &
After ibus-daemon is invoked, Run ibus-setup to change your preference to obviate Alt-Shift from changing your input language.