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I need to install Ubuntu as dual boot option on a HP Z800 Workstation which has Windows 7 installed. Ubuntu installer cannot detect Windows and complains "This computer currently has no detected operating systems". I tried to allocated a partition of 200GB of free space using Windows disk manager, and the Ubuntu installer fails to see any free space. The PC features: 24Gb of RAM, dual Xeon CPU, 2TB of disk space. Does anyone know what's going on? Windows Disk Partition image UBUNTU did not find Windows

  • will you please add screen shot of your partition table?-- – Ravan Oct 10 '15 at 1:23
  • Ravan, I just added links to the partition images captured – TonyHippo Oct 13 '15 at 17:10
  • Is it gpt?...to know: open command prompt--> type diskpart -->enter-->type list disk...please add output to Q – Ravan Oct 14 '15 at 1:13
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Do you know, if the hard disk uses a GPT or a MBR structure? If it is GPT, there should be also a corresponding fake MBR. Maybe these two are not consistent.

Some time ago, I had a similar problem. The Ubuntu installer could not detect the fresh Windows 7 installation. I solved it by wiping the first sectors of my hard disk. Then I could create a clean MBR structure and install Windows and Ubuntu again. Before you continue with any experimental steps, you should create a complete backup of your Windows installation.

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