In Ubuntu 17.10 key combinations like Ctrl + Shift + Alt + ... don't work

I upgraded Ubuntu to 17.10 and found out that alt key has strange behavior.
If I press Alt+Space, for example, I can see the menu of the active window, but If I press more complicated combination like Ctrl+Shift+Alt+some_letter, it doesn't react. In Ubuntu 17.04 it worked.

The only way of solving this problem I know is to use gnome-tweak-tool. In this gnome-tweak-tool, I can swap key Win (Super) with key Alt. In this case everything works great, but... I would like key Win to be key Win and key Alt to be key Alt. So, may be there is a good solution for this problem?

Solution 1:

There's an simple workaround here:

In case you don't need to switch between keyboard layouts, you can get some shortcuts working again if you use the "Tweaks" tool for Gnome.

sudo apt install gnome-tweak-tool

Then

1. Open "Tweaks"
2. Select the tab "Keyboard & Mouse"
3. Click "Additional Layout Options"
4. Disable entries in the "Switching to another layout" dialog

In my case this gave me back the "ALT + SHIFT" combinations which are essential in the Eclipse IDE for refactoring.

It works beautifully!

Solution 2:

I was able to solve this problem using the patch from this ticket. But the latest supported version is 1.19.3 while actual is 1.19.5 so this also requires some changes in patch/shell script to work.