I have a big problem with my computer because I cannot access to my linux. My computer is dual boot with windows 7 and ubuntu. When I upgrade to windows 10, I lost my grub dual boot. To repair it, I used boot-repair-disk(https://sourceforge.net/projects/boot-r … p_redirect). Boot is repaired but only for windows, grub having totally disappeared. I have a 256GB SSD with 100GB for linux. My partition yet exists, I see it with fdisk but it appear that this partition is broken. I try to use Gparted to repair my different partition but this program see nothing because overlapping problem etc

I give you the configuration of my computer generated with my usb boot-repair-disk :


Is it possible to restore grub and have a dual boot without formatting my linux partition ?

Thanks in advance.


  • I find that boot repair pretty much causes more problems than it solves. Your data is likely fine but just be cautious. Try out running testdisks "lost partitions" function: cgsecurity.org/wiki/TestDisk – jdwolf Jan 6 '18 at 22:53
  • The error is apparently due to extended partitions as all of those are lost. – jdwolf Jan 6 '18 at 23:00
  • The remaining disk space after partition 3 is roughly 105GB (not GiB), i could guess you had 100GB Linux and a 5GB swap? – jdwolf Jan 6 '18 at 23:05
  • Yes I think i do a swap when I install linux – Olivier Nauw Jan 7 '18 at 1:01
  • Seems to be related to this long standing Windows bug: social.technet.microsoft.com/Forums/windows/en-US/… Based on your Boot repair log your extended partition is not 1MB aligned which is what trips up that bug. However I wouldn't have expected it to still affect Windows 10. – jdwolf Jan 7 '18 at 2:53

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