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I have Windows 10 and Ubuntu 16.04 running on 2 hdd and 1 ssd. 1TB ssd is what I've been dual-booting from, with 500GB for Windows and 500GB for Ubuntu. One other hd is for Win (3TB) and one for Ubuntu (1TB).
After a Windows update, I got the grub rescue screen, but wasn't able to restore the dual-booting status. I've tried several different things, including most in this post with a similar issue. Tried boot-repair several times with no effect. Here is a recent pastebin.

ASRock mobo is currently set to UEFI with options for legacy BIOS for some things. Not sure if this is relevant, but wanted to mention it here. Have not found an EFI file in ubuntu.

Any help greatly appreciated.

scott
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  • Did you accidently leave in a USB drive? Because this happened with me, windows booted up and "fixed" all my drives for me. That was the end of my dual boot setup. – Owl Feb 29 '20 at 18:10

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Looks like your master boot record is busted, i would suggest rebuilding the grub config using a usb boot image, read instructions here https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

syfluqs
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