Cannot boot Debian 9.1 using ext4 / with Windows 10 and EasyBCD 2.3 final. Any suggestions? I have existing Windows 10 Pro installed on MBR disk using Windows MBR boot loader, with the usual three Windows partitions (System, C:, Data/Recovery). I installed Debian 9.1 into two logical partitions, and installed Grub into the / partition. Booting into Ubuntu USB I can verify the Debian / partition appears to correctly have /boot and grub configured. The physical layout and partition numbers are (counting partitions from 1): Primary 1 Windows System Primary 2 Windows C: Logical 5 Debian swap Logical 6 Debian / (including /boot and grub) Primary 3 Windows Data (recovery?) When I boot I get the Windows boot menu choice. If I select the EasyBCD added Debian entry just get grub4dos command line. Does not matter if in EasyBCD I selected the auto option, or partition 6.