Recovery Using the Ubuntu Desktop/Live CD (RECOMMENDED)

https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

RecoveringUbuntuAfterInstallingWindows
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Contents
Recovery Using the Ubuntu Desktop/Live CD (RECOMMENDED)
Introduction
Create and boot from a Live CD
Are you using Grub or Grub 2?
Overwriting the Master Boot Record
For Grub Legacy
Troubleshooting
I don't see a Grub menu
Grub comes up in shell mode with no boot menu
What if Grub 2 does not list Windows
Grub 2 gives "error: no such device: xxxxx.xxxxx.xxxxx.xxxx"
What if Grub Legacy misses Windows
Recovery using Microsoft Windows and Its Bootloader
Restoring GRUB
Making Windows Load GRUB (and then Linux)
Recovery Using the Unofficial Rescatux
Recovery Using the Unofficial "Super Grub Disk"
From within Windows
As a standalone cd/floppy/usb
Preserving Windows Bootloader
Recovery Using the Ubuntu Alternate/Install CD
The GUI Way: Using the Alternate/Install CD and Overwriting the
Windows bootloader
Recovery Using Third-Party Proprietary Software
Troubleshooting
Preparing Your Working Environment
Recovering GRUB Automatically
Recovering GRUB Manually
Configuring the GRUB Menu
GRUB Resources
This page documents how to restore or recover the boot-loader after
installing Windows. Ubuntu uses the Grub boot-loader; refer to the
GrubHowto or Grub2 for more information on Grub. Some reasons to
repair your boot-loader might include installing Microsoft Windows
after you have installed Ubuntu, adding or removing a hard drive, or
changing hard drive settings.

Note: These instructions provide multiple options. Pick the option
which works best for you; otherwise, choose recommended option.

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