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I just bought a new ASUS computer with WINDOWS 8 pre-installed (so UEFI and secure boot activated) and it is no more working since I did a mistake with GDISK:

I wanted to install UBUNTU alongside Windows8 in UEFI mode, but the option did not appear in the Ubuntu installer ("install ubuntu alongside Windows").

So I decided (bad decision I suppose) to use GDISK in expert mode (x option), and I did "z" option: "zap (destroy) GPT data structures and exit"

by hoping I will have the "install alongside Windows" option in the installer.

And now, each time I start computer, the BIOS (UEFI) appears, and the PC block on it, Windows 8 no more starts.

Please can you give me a solution to restore GPT partiton table?

Thank you in advance.

Sylvain

Sylvain
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2 Answers2

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The z option in gdisk completely destroys the partition table, so you effectively no longer have your Windows installation. I know of at least four solutions to this problem:

  • Call the manufacturer, get a Windows restore disk, and restore the system to the factory default.
  • Obtain a Windows retail disk and install it to your computer.
  • Use TestDisk or some similar tool to recover your lost partitions. You may need to then run a Windows emergency tool to make the computer boot to Windows.
  • Install Ubuntu to the blank disk and forget about Windows.

After any of these options, you can try again with your Ubuntu installation, but you'll probably need to use the "Something Else" option if you want to dual-boot with Windows, since most (all?) people who've tried it report that "Install Alongside" doesn't work on GPT disks.

Note that the first two options will leave you with a fresh Windows installation. If you have user data files on the disk, you should favor the third option, or try to recover your personal data files before proceeding with either of the first two options.

Rod Smith
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Did you deleted windows 8 (C drive) Partion ?

Boot for ubuntu live cd and make sure you din't delete c drive, if you done so most probably your grub is messed.

Rahul V Sharma
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