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I am a new Ubuntu user. Last night I installed Ubuntu 16.04 to dual boot with Windows 10, but now I can't see Windows 10 in the boot menu - although all of the Windows system files and folders are shown in my laptop.

When I boot, there are only three options:

 1. Ubuntu 
 2. Advanced options for Ubuntu 
 3. System setup 

I tried to install Ubuntu again, but after some stage it says:

  • Erase all and install Ubuntu 16.04 LTS
  • Install Ubuntu 16.04 LTS alongside Ubuntu 16.04 LTS..., etc.

Now what can I do?

  • How can I get back into Windows 10?
  • After getting into Windows 10, what should I do next time to properly dual boot Ubuntu with Windows 10?
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This is a common problem for users who have installed Ubuntu on a system that already had a Windows partition. Running Boot Repair should solve this issue for you:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair
boot-repair

If not, then this answer, or any of the other 15 answers, to this question, Unable to boot into Windows after installing Ubuntu, how to fix?, will probably help you fix GRUB and enable you to see your Windows partition again.

It could also be worthwhile running

sudo os-prober

to see if your Windows partition is still bootable.

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