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DANGER, WILL ROBINSON! DANGER! Your partitioning data is suspicious, and might indicate an extremely dangerous configuration. I can't be sure of that, but if my suspicions are correct, you could easily trash the whole disk the next time you try to make any changes to the partition table -- or maybe even just in normal use. To figure out what's going on, ...


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First boot on your Windows Vista/7/8 installation DVD. If you have one of the many OEM computers that didn't come with a Windows installation disk, you can get the same effect with a Windows repair disk, which you can download (eg Win7-32bit, Win7 64bit) or create from another Windows Vista/7/8 computer. When you get to the Regional settings, select your ...


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As an alternative to sgdisk or gdisk, you can use fixparts. Given your disk's configuration, it should safely remove the leftover GPT data, with less risk of damage because of a typo or other user error. Even if you use sgdisk -z inappropriately (say, using an uppercase -Z rather than the lowercase -z), it won't completely erase the disk, just the partition ...


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I've been in a similar situation before and used this tutorial to resolve the issue: https://www.linux.com/learn/tutorials/776643-how-to-rescue-a-non-booting-grub-2-on-linux/ If an encrypted install of Ubuntu was done, I don't think the filesystem can be found.


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You can't do what you want with GRUB, but you can do it in at least two other ways, at least with most UEFI-based computers: You can use your firmware's built-in boot manager. Typically, you access this via a function key early in the boot process. It should present options to boot whatever EFI-mode boot programs you've installed (such as GRUB, probably ...


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As far as I know, no. While you can use MBR-partitioned disks within UEFI, you cannot use BIOS (MBR) format bootloaders, as they expect to run in a mostly "fresh" system, not inside the UEFI-prepared environment. So GRUB.efi doesn't even attempt to start one; it expects you to give an .efi path only.



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