On 16.04 LTS
indicator-bluetooth depends on unity-control-center, indicator-applet-complete
depends on indicator-bluetooth and so on. So it is a kind of dependency
problems. It seems that indicator-keyboard indirectly may depend on
Moreover left Alt+Shift is shown as "Alt+Mod2+Next Group" and Ctrl+Shift
as "Ctrl+Mod2+Shift L".
My problem is not unique, other user on AskUbuntu
(https://askubuntu.com/q/912640/66509) has this problem too.
I fixed this bug by switching to MATE Desktop Environment. I do not like
current GNOME development.
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Unable to use Alt+Shift as layout switcher in GNOME FlashBack session
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