Comment 28 for bug 881046

Personally, I don't like downgrading, and I cannot help you with that.
However, since and I miss a virtual monitor not because of the small size of my monitor, but because I often have plenty of terminal windows open, I found a satisfactory workaround with a better use of my desktops.
I installed the compizconfig-settings-manager, then run it, enabled the "Desktop Wall" plugin, then selected in the "Edge Flipping" configuration tab the "Edge Flip pointer" option, and I have a quick access to sibling workspaces.