VSCode "Open Containing Folder" shortcut broke on Linux Mint - linux

I am trying to use the "Open Containing Folder" keyboard shortcut for VSCode.
I am running VSCode 1.23.1, on Linux Mint 18.3.
I have confirmed the command works correctly when I use the mouse to initiate from the context menu.
But when I use the Alt+Ctrl+R hotkey, it fails to work.
So either VSCode is broke or Linux Mint is eating that key combo.
I can not seem to confirm if the key combo is already assigned in Linux Mint. I have tried assigning that key combo to something else and it did not warn me that it is already mapped....so I assume it is not.

Left click on the file or folder first, then Ctrl+Alt+R should work.
If you're cursor is inside the text of the file, the shortcut will not work.
You may need to upgrade to VSCode Version 1.24.0.

Make sure US keyboard is first keyboard:

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Iʼm running VSCode on Linux. Its window contains menu bar (usual style: File, Edit, ..., Help) which is accessible only with the mouse. I havenʼt managed to find a shortcut to select a menu item or even the whole menu bar. This differs from Windows where this menu is controllable using regular Windows style (Alt+F for File, etc.)
Is there a shortcut to go to the menu bar or its item? What is its name, if present?
Linux = Ubuntu 20.04+KDE, freshly updated.
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It works well for me (Ubuntu: 20.04.4 LTS, VSCode: 1.68.0) and it is supposed to work in the same way for Linux or Windows. https://en.wikipedia.org/wiki/Table_of_keyboard_shortcuts.
What happen when you press Alt? Can it select the menu bar?

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In case anyone else runs into this:
For Cinnamon desktop: go to Preferences > System Settings > Windows. Click on the Behavior tab. Change the "Special key to move and resize windows" from Alt to Disabled (or a different key).
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What you are looking for are context menu actions. So keep it that way.
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