I am very used to alt-drag for moving and resizing windows.

However, I can't get it to work in xubuntu 13.10. (I just recently installed it in a virtual box machine). If I change it to a different key (shift for example), shift-drag works as expected. When it is set up to use alt, and I press the alt key, it activates the menu shortcuts, but doesn't drag or resize windows if I click.

EDIT:

Yes, that sounds like exactly the setting I need to change. However, when I pull up the keyboard settings, that tab isn't there. I'm using xubuntu 13.10.

So where else might that setting live?