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As the title says I installed most recent elementary os on my pc. Unfortunately it was very complicated.

The setup before installation: Windows 10 was running on sda1, on sdb2 I have a 3tb disk to store files and work. sdc was also there but rarely used. Therefor I planned to install elementary on sdc3. During installation I realized Windows had some partition on sdc3 (about 500MB) but also, same size, on sda2 (with sda1 beeing the partition where the data is stored on). I tried installing elementary on sdc with an efi partition... but as expected no luck.

What I did to get a working elementary / Situation now: I really wanted to get elementary on sdc and tidy up that messy installation. Therefore I deleted the windows partition on sdc, hoping I can reference from grub to sda1. First issue was: Grub was giving me no menu. So I edited /etc/default/grub. It looks like this now:

GRUB_DEFAULT="0"
GRUB_TIMEOUT_STYLE="menu"
GRUB_TIMEOUT="5"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

Now I have added an entry in grub. 40_custom_proxy:

#!/bin/sh

exec tail -n +3 $0

# This file provides an easy way to add custom menu entries. Simply type the

# menu entries you want to add after this comment. Be careful not to change

# the 'exec tail' line above.

menuentry 'Windows 10' {
    search --fs-uuid --no-floppy --set=root 6470845B70843638
    chainloader (${root})/EFI/Microsoft/Bood/bootmgfw.efi
}

This uuid leads to sda2 (that one with about 500mb). Grub tells me upon choosing it that I have no such directory (also tried it with sda1 but this one didn't work either).

As you might see I am not too expierienced with grub but I looked some things and I guess those solutions should work, right? That also means the partition on sdc was the windows bootloader... right?

How should I procees from here on out? Make a Windows USB start disk? Repair the Windows bootloader? Will that kill grub so I need to reinstall it with a live-usb?

Thanks for any hints!

PS: Also posted this in elementary os forums. Since the activity is not that high as I realized I posted it here as well.

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