After updating to Ubuntu 20.10 the problem is back. Brazilian ABNT2 keyboard layout.
Commenting the modifier line is not a valid workaround anymore. // modifier_map Mod3 { Scroll_Lock }; -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1777708 Title: Desktop briefly becomes unresponsive when typing on 2 keyboards at the same time To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1777708/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs