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By default the key-mouse combination activates the window menu.

The "activate the window menu" shortcut is currently set to "alt+space."

The Alt-RMB key combo is used in blender for selecting edge loops.

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Install the compizconfig-settings-manager package and run ccsm. At General | General Options | Key bindings | Window Menu click on Alt<Button3>, de-select Enabled and click OK.

P.S. If this doesn't work, assign a different key to Window Menu. Thanks to Morichalion.

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Doesn't work as written. When I switch tabs or windows, it resets the keybinding. I set it to another key, and that made the setting stick. – Morichalion Dec 13 '12 at 22:01

Fix Alt-drag window move:

With Unity-2D (and now Gnome 3), this is controlled using the /apps/metacity/general/mouse_button_modifier GConf key. To disable Alt+Click dragging, run:

gconftool-2 --set /apps/metacity/general/mouse_button_modifier --type string '<Super>'

To re-enable it, run:

gconftool-2 --set /apps/metacity/general/mouse_button_modifier --type string '<Alt>'

Note that this GConf key controls several mouse shortcuts:

  • Alt+Click: Move windows

  • Alt+Middle Click: Resize windows

  • Alt+Right Click: Open a generic window menu

Alt-drag fix for gnome 3:
Here is the new fix:

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

If that doesn't work, try this:

  1. install dconf-tools:

    sudo apt-get install dconf-tools
  2. Then run:

  3. Then navigate to:

    org → gnome → desktop → wm → preferences → mouse-button-modifier
  4. Change the value to:


  5. Close the dconf-editor window.

Why this should be necessary when there's a dialogue for system hotkeys under keyboard preferences, is beyond me. Very frustrating having to hunt it down with each new release/update of gnome!

Source: Disable Alt for window move in gnome-shell

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I set the value as "<Alt>+<Super>" so I can use 'Alt' in Inkscape and 'Super' for activities – Crimbo Mar 17 '13 at 17:31

Try shift + alt + RMB. That was the best solution I could find. You can customized your keys in Blender's user preferences to change loop selection to something else too.

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