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So, i've recently installed Debian in dual boot with Windows 8. When I reboot, my GRUB doesn't show Windows 8. My initial question is : How do i know if Windows 8 is still existing. If it is, how to add it in the GRUB. If not, what to do?

I'm going to show you some commands:

cat /proc/cpuinfo:

processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 69 model name : Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz stepping : 1 microcode : 0x17 cpu MHz : 876.281 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid bogomips : 4788.36 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 69 model name : Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz stepping : 1 microcode : 0x17 cpu MHz : 801.468 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid bogomips : 4788.36 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 69 model name : Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz stepping : 1 microcode : 0x17 cpu MHz : 822.281 cache size : 4096 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 2 apicid : 2 initial apicid : 2 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid bogomips : 4788.36 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 69 model name : Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz stepping : 1 microcode : 0x17 cpu MHz : 800.156 cache size : 4096 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 2 apicid : 3 initial apicid : 3 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid bogomips : 4788.36 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management:

fdisk -l:

Disque /dev/sda : 698,7 GiB, 750156374016 octets, 1465149168 secteurs Unités : secteur de 1 × 512 = 512 octets Taille de secteur (logique / physique) : 512 octets / 4096 octets taille d'E/S (minimale / optimale) : 4096 octets / 4096 octets Type d'étiquette de disque : dos Identifiant de disque : 0x1a48fb9c Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 1465145343 1465143296 698,7G 7 HPFS/NTFS/exFAT Disque /dev/sdb : 111,8 GiB, 120034123776 octets, 234441648 secteurs Unités : secteur de 1 × 512 = 512 octets Taille de secteur (logique / physique) : 512 octets / 512 octets taille d'E/S (minimale / optimale) : 512 octets / 512 octets Type d'étiquette de disque : dos Identifiant de disque : 0xdcc1cf69 Device Boot Start End Sectors Size Id Type /dev/sdb1 2048 19531775 19529728 9,3G 83 Linux /dev/sdb2 19533822 234440703 214906882 102,5G 5 Extended /dev/sdb5 19533824 28186623 8652800 4,1G 82 Linux swap / Solaris /dev/sdb6 28188672 234440703 206252032 98,4G 83 Linux

Maybe, should I write a few more commands?

EDIT: Well I did install Debian after Win8, but my main issue was that I installed Debian over Win8. So Grub didn't find Win8, because Win8 wasn't there anymore.

Improve this question
4
  • Did you install Debian before or after Windows? Commented Dec 22, 2015 at 16:09
  • I installed Debian after Windows Commented Dec 22, 2015 at 16:09
  • Try reinstalling GRUB on Debian keeping Windows disk present (grub-install /dev/sdb) Commented Dec 22, 2015 at 16:11
  • I wrote this command line: I got No error. After reboot, I still have only Debian Commented Dec 22, 2015 at 16:13

1 Answer 1

Reset to default
1

Configure your grub file. grub-mkconfig -o /boot/grub/grub.cfg .It will find your windows boot manager and add boot menu entry for EFI configuration. Reboot the system.

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2
  • Actually, at the time I asked this question, I didn't have win8 anymore, I installed Debian over it. Commented Jun 4, 2016 at 9:02
  • 1
    In case of dual boot with Debian or Debian based distribution, install and write everything to file and don't install grub now, make a UEFI bootable USB disk of "system rescue CD" and then install grub and configure it. Never install grub at the disk partitioning because it overwrites entries in gpt files and may harm Windows EFI files. Commented Jun 4, 2016 at 13:47

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