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  1.    07 Jan 2016 #1
    Join Date : Jun 2015
    Sunnyvale, CA
    Posts : 123
    Windows 10 Pro 64-bit

    Upgrade to Win 10 v10586 from 10240 on GRUB-based system fails


    I had Windows 10 build 10240 running on my older computer but the upgrade to build 10586 failed.

    This is an older system - non-UEFI - with a MBR boot volume.

    The boot volume has 4 partitions: Windows 10 Pro (NTFS), Data (NTFS), Linux (ext4) and Linux swap. There are none of the extra 'normal' special partitions like the small EFI and MSR one usually finds on more modern systems.

    The system boots from grub to either windows or Linux.

    This has worked on Windows 8 and the upgrade to Windows 10 build 10240.

    But when I install the newest Windows build 10586, the new version of Windows 10 destroys the grub loader and I get an MBR load error.

    The volumes seem to be OK, but the boot info gets trashed.

    I've restored back to Windows 10240 and tried on a different hard disk and I got the same results.

    I tried restoring the MBR and also tried using 'bootrec /fixmbr' but nothing seems to work.

    I am restoring a third time back to Windows 10 build 10240 and I will try something else.

    Perhap I should try to remove grub before the next upgrade attempt.

    Has anyone else encountered this issue and have any ideas?
      My ComputerSystem Spec
  2.    07 Jan 2016 #2
    Join Date : May 2015
    Central IL
    Posts : 4,355
    Mac OS Sierra
      My ComputerSystem Spec
  3.    07 Jan 2016 #3
    Join Date : May 2015
    Central IL
    Posts : 4,355
    Mac OS Sierra
      My ComputerSystem Spec
  4.    07 Jan 2016 #4
    Join Date : Jun 2015
    Sunnyvale, CA
    Posts : 123
    Windows 10 Pro 64-bit
    Thread Starter

    Thank you, bro67.

    From what I read those instructions are to fix the grub loader entries after Windows updates clobbers grub.

    I wonder why the upgrade from 8 to 10240 did not clobber grub, but the 10586 upgrade did.

    Anyway, since I rarely use Linux, and could boot a LiveCD from a flash drive for recovery purposes if needed, I think I will try to remove the Linux partitions and get this to be a standard Windows disk so that I don't have to do this again.
      My ComputerSystem Spec
  5.    07 Jan 2016 #5
    Join Date : May 2015
    Central IL
    Posts : 4,355
    Mac OS Sierra

    Upgrade to Win 10 v10586 from 10240 on GRUB-based system fails


    It is because Windows wants to always use its own boot loader. There are better ones out there.

    You can also use a Pen Drive with the latest. UEFI is still a work in progress with Linux.
      My ComputerSystem Spec
  6.    07 Jan 2016 #6

    Account closed as requested
    Join Date : Dec 2015
    Posts : 72
    Windows 10 Home x64 v1511, many others virtualized

    It should be better to have GRUB2 in partition boot sector instead of MBR, and to add Linux boot entry into Windows BCD using VisualBCD program. If you have Windows under GRUB2, hibernation and Recovery probably will not work correctly (according to my own experience).
      My ComputerSystem Spec
  7.    07 Jan 2016 #7
    Join Date : Jun 2015
    Sunnyvale, CA
    Posts : 123
    Windows 10 Pro 64-bit
    Thread Starter

    I decided to start from scratch with a clean install beginning with my original Windows 8 Pro DVD.
      My ComputerSystem Spec
  8.    07 Jan 2016 #8
    Join Date : Dec 2015
    Posts : 6,407
    Windows10

    Quote Originally Posted by arachnaut View Post
    I decided to start from scratch with a clean install beginning with my original Windows 8 Pro DVD.
    You did not need to do that - you could have just installed 10586 and use 8 key.
      My ComputerSystem Spec
  9.    07 Jan 2016 #9
    Join Date : Jun 2015
    Sunnyvale, CA
    Posts : 123
    Windows 10 Pro 64-bit
    Thread Starter

    Quote Originally Posted by cereberus View Post
    You did not need to do that - you could have just installed 10586 and use 8 key.
    The mediacreationtool thumb drive will not do a clean install unless you are already logged into windows.

    At least that's what happened to me.

    I did upgrade from 8.0 Pro to 10 10586 directly with the mediacreationtool image.

    At the moment I am doing a clean install of Win 10 in that upgrade.
      My ComputerSystem Spec
  10.    08 Jan 2016 #10
    Join Date : Dec 2015
    Posts : 6,407
    Windows10

    Quote Originally Posted by arachnaut View Post
    The mediacreationtool thumb drive will not do a clean install unless you are already logged into windows.

    At least that's what happened to me.

    I did upgrade from 8.0 Pro to 10 10586 directly with the mediacreationtool image.

    At the moment I am doing a clean install of Win 10 in that upgrade.
    You are confusing a clean install with an ugrade not keeping files.

    A clean install wipes all traces of previous OS and you have tou boot from a bootable usb stick or dvd OUTSIDE of windows i.e. same way as if the hard drive was blank.
      My ComputerSystem Spec

 
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