Solution I have found by searching various websites on the net.I am sharing this with all of you now.It will also help me to findout when i will stuck at this problem again 🙂
It’s simple .
Just do this in your ubuntu terminal :
sudo apt-get update
sudo apt-get install synaptics
Why happened this:
Maybe you clicked to disable the touchpad in your laptop like this:
Now showing like this :(…Where no synaptic touchpad option in laptop.