Errors

“How to fix windows mbr from ubuntu”

Method One:Boot Repair Utility

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt update
sudo apt install boot-repair

Method Two: Syslinux

sudo apt-get install syslinux

sudo dd if=/usr/lib/syslinux/mbr.bin of=/dev/sda

sudo apt-get install mbr
sudo install-mbr -i n -p D -t 0 /dev/sda