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Reinstall the GRUB boot loader this way : Boot from Ubuntu installation media. Open a terminal and execute : sudo mount /dev/sda2 /mnt sudo mount /dev/sda1 /mnt/boot/efi for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done sudo chroot /mnt grub-install /dev/sda update-grub Note : sda = disk | sda1 = EFI partition | sda2 = system ...


According to a Launchpad bug page, it needs a sponsor to upload it to the Ubuntu and Debian repositories. I read down the thread a bit and, while its rather old, it seems the developer still has no sponsor.


There are several ways to do what you want: You can use the same bcdedit command in Windows, but instead of \EFI\ubuntu\grubx64.efi, you can specify \EFI\Microsoft\Boot\bootmgfw.efi. You can use the EasyUEFI program in Windows to manage the EFI boot entries in a GUI way. This is likely to be less error-prone that bcdedit. Move the Windows entry to the top ...


In your pastebin, it's mentioned that: Please disable SecureBoot in the BIOS. Then try again.Do you want to continue? So you should disable secure boot in your BIOS completely. Also make sure that Windows 10 and Ubuntu are both installed in EFI mode.

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