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I've tried to install Ubuntu 12.04 from USB following the official instructions I created the USB key and started the install.

I chose to install Ubuntu alongside Windows and kept the suggested partitioning scheme.

At the end of the install I rebooted and the bootloader is not there and Windows boots.

I have tried with both Universal USB Installer (suggested on the Ubuntu site) and with Unetbootin.

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Please run boot info script bootinfoscript.sourceforge.net and post the RESULTS.txt which it produces. –  Jordan Uggla Jun 17 '12 at 15:58
    
Thanks for trying to help but I've since lost patience and nuked all other partitions and I'm installing Ubuntu alone. Hopefully this time it will work. –  L. De Leo Jun 17 '12 at 16:43

2 Answers 2

In my case, the boot loader was installed on my USB.

I fixed it by booting into Linux with the USB and then run grub-install on the drive (/dev/sda in my case) again, which will install and configure grub to the drive.

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Put windows disk and click on Repair. Start command prompt

Type

Bootrec.exe/fixmbr
Bootrec.exe/fixboot

You should get your Bootloader back.

Edit In case you don't have installation media:

  • You can download recovery disk from your Manufacturer.

  • You can download , master boot record disk and use it to repair boot record.

  • You can do complete system backup using your Backup Drive. ( Provided as recovery disk from manufacturer.)

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Unfortunately I don't have any Windows media: it came preinstalled on my Lenovo laptop. What alternatives do I have? –  L. De Leo Jun 17 '12 at 13:58
    
He is saying that he can boot windows. Does your command bring back Ubuntu –  Anwar Shah Jun 17 '12 at 15:45
    
If look at my answer, it repair boot record. It can bring Ubuntu Back –  BigSack Jun 19 '12 at 3:36

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