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I've upgraded a 16.04 LTS to 18.04 LTS where language switching already had the alternative combination of alt+shift.

While changing languages works, it appears that moving a window to a different workplace with key combinations like ctrl+shift+alt+down, fails and acts as the same keypress but without alt, which just changes the workplace.

I've confirmed with xev that each individual keypress and combination get detected, with the exception that when alt+shift are active at the same time, regardless of holding ctrl or letting the keys go, the keysum named ISO_Next_Group appears and any further detection is blocked.

If I remove the alternate language switch combination (using gnome-tweeks) everything works fine.

I've tried to replace the default language switch of super+space to alt+shift from settings->keyboard and it's not detecting any keypress of alt, shift, ctrl unless another key is pressed. This means I can not set alt+shift but maybe alt+shift+k which I don't want.

It looks like there's a similar bug report with about 300 comments from... 2004 till today (2018), but I'm not sure if it applies to the exact problem because it was working till now and I can't believe the exact same problem can be 15y old and noone ever bothered.

Am I missing something?

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    Possible duplicate of OS keyboard shortcuts conflict with apps keyboard shortcuts . I hope that my PPA may fix your issue. And it is unbelievable that Xorg, Debian and Ubuntu developers do not care about this bug for 14 years(!!!!).
    – N0rbert
    Jul 4, 2018 at 20:15
  • Thanks for your comment, it is quite possible this fix will do, as it moves detection of combinations to when keys are released instead of pressed. I will come back with the results. Does anyone know why it used to work in 16.04 and stopped in 18.04? Is it the switch to gnome?
    – user221931
    Jul 5, 2018 at 9:11

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The suggested linked question OS keyboard shortcuts conflict with apps keyboard shortcuts did the trick for me.

It still remains a mystery why it worked in Ubuntu till 18.04.

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