An update to domster answer for Ubuntu 12.10.
Unity source code has obviously changed, so here is how to achieve the same in Unity 6.8.0. The steps to download Unity source code are the same as before (I will copy & paste domster's snippet):
sudo apt-get build-dep unity
cd /tmp #It can be done somewhere else, feel free to change the base location.
mkdir unity
cd unity
apt-get source unity
At this point, the file to be edited is only /tmp/unity/unity-6.8.0/plugins/unityshell/src/unityshell.cpp.
Find the method UnityScreen::InitGesturesSupport() (line 3368 for Unity 6.8.0).
Then, comment all the lines starting with gesture_sub_launcher to make it look like:
void UnityScreen::InitGesturesSupport()
{
std::unique_ptr<nux::GestureBroker> gesture_broker(new UnityGestureBroker);
wt->GetWindowCompositor().SetGestureBroker(std::move(gesture_broker));
/*
gestures_sub_launcher_.reset(new nux::GesturesSubscription);
gestures_sub_launcher_->SetGestureClasses(nux::DRAG_GESTURE);
gestures_sub_launcher_->SetNumTouches(4);
gestures_sub_launcher_->SetWindowId(GDK_ROOT_WINDOW());
gestures_sub_launcher_->Activate();
gestures_sub_dash_.reset(new nux::GesturesSubscription);
gestures_sub_dash_->SetGestureClasses(nux::TAP_GESTURE);
gestures_sub_dash_->SetNumTouches(4);
gestures_sub_dash_->SetWindowId(GDK_ROOT_WINDOW());
gestures_sub_dash_->Activate();
gestures_sub_windows_.reset(new nux::GesturesSubscription);
gestures_sub_windows_->SetGestureClasses(nux::TOUCH_GESTURE
| nux::DRAG_GESTURE
| nux::PINCH_GESTURE);
gestures_sub_windows_->SetNumTouches(3);
gestures_sub_windows_->SetWindowId(GDK_ROOT_WINDOW());
gestures_sub_windows_->Activate();
*/
}
Re-build Unity following domster's instructions again:
cd /tmp/unity/unity-6.8.0
dpkg-buildpackage -us -uc -nc
cd ..
sudo dpkg -i *deb
Et voila again! Logout and log back in.
Best Answer
Install Compiz config manager:
then run compiz config manager (ccsm in terminal) or simply type ccsm in dash.
and find at the bottom of plugins list:
Unity MT Grab Handles to disable it.