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How can I check if it is dual boot os in my system or not.When I restart my system, it doesn't shows any option regarding windows OS. If there is no windows, how can I uninstall ubuntu from my system ? please help !!!

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    if you had pre-installed windows and you installed Ubuntu then you have a dual boot system. Sep 20, 2014 at 13:32
  • Open gparted. What does it show? I'm not sure of a 100% definitive way to tell if Windows is installed other than poking around and searching for it.
    – Seth
    Oct 21, 2014 at 3:05

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You seem to not know how to configure GRUB to boot from windows. You need os-prober then you have to reconfigure GRUB.

sudo apt-get install os-prober
sudo grub-mkconfig -o /boot/grub/grub.cfg

After that second command, you should find something that says that a Windows medium has been found or something.

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