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PC model- Lenovo Ideapad 300 OS- Windows 10 dual booted with Ubuntu 18.04

I am not able to start windows or view grub menu or see Lenovo logo(which was visible earlier) after one fine day I put my Windows to sleep. Sleep mode was working perfectly fine earlier. Now only Ubuntu 18.04 is starting and grub menu is not visible, also windows is not able to start properly. The display is black until Ubuntu loads. How can I recover windows and bios. When grub is updated in terminal it successfully detects all OS.

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Most boot/dual boot issues can be fixed with the awesome Boot Repair utility:

Boot-Repair

Make yourself a boot repair disk, boot it and run the Recommended Repair utility.

  • Kindly view the boot info file link . here it says that no bootloader is installed. What can I do next? – NITISH BAHL Aug 18 '18 at 1:10
  • I think that was the problem that it found... did you remove the boot repair disk and reboot? – Joshua Besneatte Aug 18 '18 at 1:15
  • Yes, but no progress, the screen is still blank. – NITISH BAHL Aug 18 '18 at 1:17
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Try changing the grub boot manager timeout so that you get a change to select the OS on startup. To do this, boot into Ubuntu and then edit the following file.

sudo nano /etc/default/grub

Modify the line with GRUB_TIMEOUT to something like

GRUB_TIMEOUT=30

After that you need to update the grub setup in your boot manager

sudo update-grub

You should now be able to select your Ubuntu or Windows OS in the boot manager menu.

  • Kindly view the boot info file link . here it says that no bootloader is installed. What can I do next? – NITISH BAHL Aug 18 '18 at 1:09
  • grub is not displaying nor is the lenovo logo during boot(used to display earlier), the screen remained blank if I forced windows to boot – NITISH BAHL Aug 18 '18 at 1:16
  • @NITISHBAHL There should not be a bootloader installed in the MBR, you are using EFI booting. The Ubuntu EFI is shown to be installed in sda1. grubx64.efi will be loaded by the BIOS, not bootloader in MBR. – Bernard Wei Aug 20 '18 at 17:51

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