I have Ubuntu and GNOME 3 and when I do Alt+Left-click it grabs the current window. How do I stop this from happening, as I need this shortcut in Blender which I update often so changing it inside Blender is not logical.
If CompizConfig doesnt work for you, try this:
Fix using dconf Editor
Install dconf Editor:
sudo apt-get install dconf-editor
Search for dconf Editor in dash and run it, then search for
mouse-button-modifier and change the key from
<Super> or anything else. That worked for me.