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I have windows 10 preinstalled on mine laptop. I love both ubuntu and windows so I planned to make DUAL boot my laptop. Then I have installed Ubuntu as 2nd OS to my LP. Everything was successful and I had configured the GRUB(Basics like time out and Default). Then I have to restart my computer and GRUB menu appears and I choose to use Ubuntu.

After my work finished in Ubuntu, I wished to use Windows so I had restart my laptop and GRUB menu appears and chose Window. Suddenly I realized that I forgot some file to bring to Windows so that I wanted to go back to Ubuntu so again restated Laptop. After the restart, I came to know that there is no GRUB menu so that I tried to load using BIOS but I did not found Ubuntu there also.

Both the OS has booted using UEFI(Secure boot off).

I have checked that the Ubuntu folder is there is the EFI folder(Checked through windows command prompt).

Also made the GRUB as default

I have Ubuntu partition also.

  • is fast boot turned off in windows? – ravery Jul 18 '17 at 5:15
  • Are you talking about the Secure boot? If yes then I have turned it off – bikash.bilz Jul 18 '17 at 5:18
  • No, two different things. One is a UEFI feature, the other - fast boot - is a Windows thing. – user692175 Jul 18 '17 at 5:31
  • I am not sure, can You please guide me to check that? – bikash.bilz Jul 18 '17 at 5:33
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Are you having the same problem as described here? Windows 10 changes UEFI boot order every time

It looks like your Grub boot option is overridden by Windows. You can still bring back the grub if you bring up the EFI boot selection. Or you can follow the bcdedit command to have grub default permanently.

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  • I have already used bcdedit command. How to bring up the EFI boot selection? – bikash.bilz Jul 18 '17 at 6:47
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    That's the motherboard feature. Normally it's F12 on bootup logo screen. – Cheng Du Jul 18 '17 at 7:21
  • Actually, this is the problem. Now I can't able to see the Ubuntu in the boot menu(In the BIOS). So, can you please say me, How can I bring that? – bikash.bilz Jul 18 '17 at 7:39

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