Ubuntu 12.04 has a problem with Ctrl + Alt + Down arrow key since this compination it is used to change Workspaces.
You can just disable it from compiz so you can still change workspaces with right/left arrow and also can use it in Eclipse to duplicate lines.
The procedure is :
You can just disable it from compiz so you can still change workspaces with right/left arrow and also can use it in Eclipse to duplicate lines.
The procedure is :
System->Preferences-> ConpizConfigSettingsManager
Click "Advanced Search"
Type "down" in the filter box.
Click on "Desktop wall"
Disable "Move Down".
