Currently having a nightmare dealing with this. I installed ubuntu via usb alongside windows 10 (upgraded from windows 8). When I select Windows 8 option in Grub get a:
"Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: 1.insert windos cd and run a repair your computer option. File: /boot/bcd Status: 0xc000000f Info: an error occurred while attempting to read the boot configuration data"
I can boot into ubuntu fine albeit wireless doesn't work. I enabled legacy support before install so I could boot from USB. I've tried booting from the usb I used to initially install ubuntu thinking maybe I could reinstall or repair, but it seems to ignore it. Is there some advanced startup options somewhere in ubuntu like there is in windows 10? Otherwise how will I run the Boot-Repair-Disk?
I know I should have done the research properly before doing this it's my own damn fault. Can somebody help in getting me out of this hole I put myself in?