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Recently I have installed Ubuntu on a partition using Disk Management on Windows 10. Then I was able to login to Ubuntu but it would skip both BIOS and Grab screens. Before the installation I have disabled both Hibernate and Fast Boot and I would see BIOS screen.

Then I edited my Grub file by setting Windows 10 to default boot and now I cannot access Ubuntu. Since changing Grub file changed my default boot to Windows, I am guessing that the error comes from Ubuntu side.

And I've tried setting default boot loader to Grub:

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi

But that also gave no effect. Also sometimes when booting, if I press SHIFT the screen stays black until I manually shut down and power on again.

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  • You cannot install (Full) Ubuntu to partition created by Windows. What brand/model system? May be best to see details, you can run from your Ubuntu live installer or any working install, use ppa version not older Boot-Repair ISO: Post the link to the Create BootInfo summary report. Is part of Boot-Repair: help.ubuntu.com/community/Boot-Info and: sourceforge.net/p/boot-repair/home/Home – oldfred Dec 20 '17 at 4:43
  • When I was installing, I chose "Something else" instead of "install along Windows Boot manager". So I think I need to reinstall. Do I have to restore Windows Boot Manager before clearing the partition for Ubuntu? – phoxd Dec 20 '17 at 5:13
  • If Windows 10 came with system, not upgrade from Windows 7, then you can just in UEFI select Windows. If you just used Windows to shrink the NTFS and then use Something Else to create a / (root) ext4 partition your install should be ok. What brand/model system? What video card/chip? May be best to see details, you can run from your Ubuntu live installer or any working install, use ppa version not older Boot-Repair ISO: Post the link to the Create BootInfo summary report. Part of Boot-Repair: help.ubuntu.com/community/Boot-Info and: sourceforge.net/p/boot-repair/home/Home – oldfred Dec 20 '17 at 15:47
  • Here is Boot Repair pastebin paste.ubuntu.com/26223700 – phoxd Dec 20 '17 at 22:14
  • I do not see anything wrong. If you hold shift key from BIOS does grub menu appear? – oldfred Dec 21 '17 at 1:47

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