(actually installing Xubuntu but I don't think it makes a difference)

When I attempt to install Ubuntu after setting up the partitions and beginning installation, I end up with a "the 'grub-efi-amd-64-signed' package failed to install into /target/. Without the GRUB bootloader, the installed system will not boot" error and the install cannot continue.

What led to the current situation:
So I previously had Kubuntu installed dualbooting alongside Win10, long story short I formatted the Kubuntu partition, so I've only got Windows installed atm.
Grub then proceeded to break, but with a Win10 iso I managed to 'repair' it (via bootrec /fixmbr, stuff like that). On boot I now get a grub console, if I 'exit' Windows will then boot.

Windows is installed in legacy mode if it matters, not UEFI.

  • It's been a way long time since I blew up grub but this link may help you at least boot Ubuntu. From there it should be a simple matter to fix grub. linux.com/learn/how-rescue-non-booting-grub-2-linux – jones0610 Jun 17 '17 at 4:38
  • @jones0610 I've got no Ubuntu installed atm but this will probably come in handy later, thanks! – Makoto Jun 17 '17 at 4:58
  • Windows is installed in legacy-mode. Xubuntu needs to be installed in the same mode. Reinstall Xubuntu, but make sure to boot in legacy-mode, how you boot is how you install. If you want to install in UEFI-mode, it is possible, but you would need ESP (EFI System Partition). The problem then is that Grub can handle dual-boot only for OS's installed in the same boot-mode, so better to install in legacy-mode! – mook765 Jun 17 '17 at 6:50

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