How do I disable window move with alt + left mouse button in GNOME Shell?

First of all, install dconf-tools .

To do that, run the following command:

sudo apt-get install dconf-tools

Then open it, Alt+F2 → dconf-editor.

Scroll down to org → gnome → desktop → wm → preferences → mouse-button-modifier → Set it to whichever key you like.

Or, equivalently,

gsettings set org.gnome.desktop.wm.preferences mouse-button-modifier "<Super>"

in the terminal. (This requires neither dconf-editor, nor dconf-tools )

Warning: Setting it to nothing means that all clicks move windows, instead of disabling it!

In Mint(or Cinnamon) the key can be changed or disabled under

system settings > windows > behavior > 'Special key to move and resize window'

I have it set to the super/windows key instead.

Use the Tweak Tool (gnome-tweak-tool):

Windows > Window Action Key

To resolve the Alt+Click move window dragging problem:

sudo gconftool-2 --set /org/gnome/desktop/wm/preferences/mouse-button-modifier --type string '<Super>'

Does the same thing, really, just with a different config tool, and less hunt-and-click.

For newer versions using dconf/gsettings, use this:

gsettings set org.gnome.desktop.wm.preferences mouse-button-modifier "<Super>"

I set Alt+Super like a temporary solution. So I can use the Alt key in Inkscape and Super for activities.