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I tried to install Ubuntu 18.04 as a second OS, but now neither of them is booting anymore. While boot "System BootOrder not found. Initializing defaults. Boot System." is displayed. See the screenshot below.

Screenshot: Boot Error
Boot error

I followed this guide and created two (/ and /home) partitions like in the screenshot below:

Screenshot: Partitions
Partitions

Beause it did not work and displayed this:

grub-efi-amd64-signed failed installation /target/

I found this solution to create a third FAT32 boot/esp partition to successfully install grub and Ubuntu, but now I can't boot either of them.

Some more screenshots:

Screenshot: Boot menu
Boot menu

Screenshot: UEFI boot settings
UEFI boot settings

Did I mess with the bootloader/MBR, and why did I need to create the esp/boot partition to install grub?

Additional information:

Secure boot configuration

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  • It might help to have some additional information: Do you have Sceure Boot enabled or disabled? If you have, could you use a boot cdrom / USB stick and try if the file systems on the hdd are still in a valid state? Is the first (small) partition on the nvme (p1) a rescue system or does this solve other purposes, like an UEFI partition already?
    – pdr
    Apr 27, 2018 at 13:00
  • @pdr Which information should I provide? Apr 27, 2018 at 13:03
  • sorry, hit the enter key too fast, edited original comment.
    – pdr
    Apr 27, 2018 at 13:03
  • @pdr Secure Boot is disabled. I added the screenshot at the end of my question. Right now I am running ubuntu from a live usb device. I can see all the data on my windows 10 partitions, so it seems like they are in a valid state. I don't exactly know the purpose of nvme (p1). I just know windows 10 installation created it automatically while installation. Only p2 and p3 where created by hand while windows 10 installation. Apr 27, 2018 at 13:17
  • - Thank you. To be precise, the screen shot doesn't show anything obvious about secure boot, just UEFI which isn't the same ;) I assume, you gave it a try switching off Legacy Boot and CSM support?
    – pdr
    Apr 27, 2018 at 13:32

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