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<p>in other words what is the equivalent in Ubuntu to the (win key + arrow) shortcut in Windows OS</p>
Install the below mentioned software.
sudo apt-get install compizconfig-settings-manager2-
open it by going to start---> settings---> compiz config settings manager -- >
then open the window management ----> grid .
there you will find the put left and put right.
and can also adjust key combination but be careful it can halt your system window manager if you make a wrong configuration there.