I have a new Win 10 Pro installation (from an MS DVD) on a PC upon which I then installed Deb 9 as a second OS dual-bootable. Boot selection works fine with either OS.
I have an old Win 10 installation (upgraded from the original Win 7) on a laptop upon which I originally installed Deb 7 dual-bootable (the Deb 7 was in-place upgraded to Deb 8, then Deb 9). Boot selection works fine with either OS. Both computers are 64-bit with grub2 and of four standard partitions and one or more extended ones. Both computers have an abundance of HD space on boot and main partitions for each OS. Problem: Neither Win 10 OS has been able to successfully update since about last April. I have tried all the things I have found in an Internet search, including making sure the Win partition is marked boot-able, and downloading and running the Win 10 trouble shooter--all to no avail. I should have asked here first, but at last I'm here. Has anyone had the same problem (no Win 10 updates) with dual-bootable Debian 9? Thanks. Best regards, -Tom
