Re: boot-repair can't reinstall grub
Yann can help you more with boot-repair since he developed the software. Also, I don't use UEFI but I have few things to point out:
On new UEFI enabled computers/boards for most boot devices you have two separate devices, the older legacy boot version and the UEFI version (usually with UEFI prefix). That applies to optical drives, usb sticks, etc.
If you don't want to use uefi boot, you should look for an option in bios and whether you can disable it. BUT if windows came preinstalled in uefi mode with your machine, you can't simply disable it, it will not boot windows any more. So, you have to stick with uefi boot.
Having said that, uefi dual boot still has issues, and it doesn't help that manufacturers are thinking only about Microsoft when developing products. One VERY important thing, is that if win8 is in uefi mode you HAVE TO install ubuntu in uefi mode too. In other words, you have to boot the ubuntu cd/usb with the UEFI prefix when installing. If you booted the legacy optical drive, it would load the cd in legacy mode and installing ubuntu in legacy mode (installing legacy version of grub2 instead of the uefi version).
With ubuntu you have options to "switch" grub2 to uefi version, but a new install might be easier.
How did you install ubuntu, which device did you boot?
Darko.
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Ubuntu 18.04 LTS 64bit
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