@Norbert
I have Laptop with 16.04.
And Alt+Shift, Alt+Shift+Tab are working ok.
I have also tested it with new default installation in Virtualbox.
And it also works fine.
And it doesn't matter if i use Mate or Unity.
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So. This problem is still here.
I found following situation:
On older 16.04 layout is changing with releasing Control/Shift/Alt keys.
In 18.04 layout is changing while pressing key combination.
May be it is setting somewhere in X.org?
Is it possible to find and change it?
It can affect all people
