It's MY thread and I'm having problems installing Kubuntu as a dual-boot with Window$.
The first hurdle I had was with UEFI/Legacy stopping the USB stick from installing Kubuntu.
Now, I am getting this;
Unable to configure GRUB
Executing 'update-grub' failed
This is a fatal error.
I don't know exactly where in the installation process GRUB is installed, I'd guess near the end, so assuming that, Kubuntu was installed but GRUB wasn't. I will submit this post then go and check on the partitions to see if one is named Kubuntu.