Mouse cursor dissapears now and then in ubuntu

when I am working in ubuntu the mouse cursor dissaoeras every now and then. Due to this I am unable to work in ubuntu.I am unable to find out the actual reason behind it. Please help…

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sudo service lightdm restart
go to sysytem settings >>displays
uncheck the unknown display button

sorry I don’t find any unknown display button. And I request you to share the screenshot of the same. That would be helpful for me…