How can I switch between the workspaces? In ubuntu 12.10 , there was a workspace window to switch between 4 workspaces .... But I cannot find a way to switch between the workspaces in ubuntu 14.04....
There is a good way to customize whatever you want including workspaces in ubuntu 14.04. Install Unity tweak tool by the following command:
sudo apt-get install unity-tweak-tool
Open the Unity tweak tool (know more about Unity tweak tool) and go to "Hot Corners".
Then add workspace to one of the corners (it is usual to put it on top left in GNOME 3). Enjoy it!