According to your Boot-Repair log, you have this error when installing GRUB:
You can mark yourself "affected" by this bug:
/usr/sbin/grub-bios-setup: warning: this LDM has no Embedding Partition; embedding won't be possible.
/usr/sbin/grub-bios-setup: error: embedding is not possible, but this is required for RAID and LVM install.
As a workaround, you can install GRUB Legacy:
run Boot-Repair --> Advanced options --> GRUB options --> tick the "GRUB Legacy" option --> Apply.