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I did the following:

  1. Partitioned my C drive
  2. Installed Ubuntu 14.04 from USB .iso
  3. After my computer failed to boot, I used the boot repair disk, live from USB, to fix. This fixed the issue.
  4. I started Ubuntu and shutdown
  5. I started Windows7 and shutdown

After doing this, the machine no longer reaches GRUB. It just endlessly restarts in a loop.

What is the best way to go about debugging this? Is there a way to prevent windows interfering with the boot system?

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2 Answers 2

Reset to default
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Start ubuntu from live cd, install grub-customizer e check what happened

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If you install Ubuntu (or other OS) after installing Windows, Windows should not change the boot record.

However if Windows thinks that the master boot record has problems and attempts a fix, it will destroy your boot settings, and you have to use the Ubuntu Live USB to boot in and manually fix the issue.

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  • Thanks - yes this seems to described what's happening. Any idea how to stop it attempting a fix?
    – Lee
    Commented Apr 1, 2016 at 16:20
  • Better make sure that it isn't a UEFI/GPT Windows installation first.
    – Tom Yan
    Commented Apr 2, 2016 at 12:54

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