On Sun, Jan 15, 2017 at 06:36:36PM -0600, Charles E. Blair wrote:
I have been running version 7.11 of Debian for several
years on a desktop with a dual boot of windows and linux
via grub. I upgraded to windows 10 roughly 8 months ago,
and the system continued to work.
On January 9, I noticed that the grub menu no longer
displayed a windows option, instead displaying linux
options twice. This problem may have occurred earlier
without my noticing it. The file /boot/grub/grub.cfg
was modified on January 4. I do not know enough to
interpret it.
I give below an abridged output from fdisk -l. I
suspect the windows 10 system is supposed to be on
/dev/sda1 or /dev/sda2, but I don't understand what's
going on.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 3074047 1536000 27 Hidden NTFS WinRE
/dev/sda2 3074048 491355297 244140625 7 HPFS/NTFS/exFAT
/dev/sda3 1924173824 1953523711 14674944 17 Hidden HPFS/NTFS
/dev/sda4 491356158 1924173823 716408833 5 Extended
Partition 4 does not start on physical sector boundary.
/dev/sda5 491356160 1890959359 699801600 83 Linux
/dev/sda6 1890961408 1924173823 16606208 82 Linux swap / Solaris
Partition table entries are not in disk order
I think that, with Windows 10, /dev/sda1 would be the boot partition and
/dev/sda2 would be the system partition.
What is the output of (as root) "os-prober"?
Can you manually start Windows 10 by the following?
* At the grub menu, press 'c' for a command line.
* Enter: set root=(hd0,msdos1)
* Enter: chainloader +1
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