ubuntu 16.04 alt + tab not working properly

I've been seeing the same thing on one system, and it's a bit annoying. I finally accidentally stumbled upon the answer for my case:

It was the Compiz switcher also capturing the ALT - TAB key combo along with the Unity switcher.

It can be disabled by installing the CompizConfig Settings Manager:

sudo apt-get install compizconfig-settings-manager

I ran it by clicking on the Search icon and typing:

CompizConfig

Then click on the icon.

Click on Window Manager → Application Switcher and disable the Next Window key.

Hope this helps you too.

or call also CompizConfig Settings Manager via Terminal:

sudo apt install compizconfig-settings-manager

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