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Thread: Not seeing Windows 8 partitions when trying to install 12.04

  1. #1
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    Question Not seeing Windows 8 partitions when trying to install 12.04

    Greetings. I am attempting to perform a Dual Boot installation on an HP P7-1225.

    I have already successfully installed Windows 8, and left enough unused space on the drive to install Ubuntu.

    When I run the install wizard though, none of the Windows paritions appear (see attached).

    I ran the boot repair utility, and it output information here:

    http://paste.ubuntu.com/1316965/

    Any assistance that can be offered would be greatly appreciated.
    Attached Images Attached Images

  2. #2
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    Do you have a UEFI system?

    You have this message.

    GUID Partition Table detected, but does not seem to be used.

    Windows when installed in BIOS/MBR mode erases the primary gpt partition table, but one of the advantages of gpt is that is has a backup. Windows ignores backup, but Linux sees both MBR(msdos) and gpt(GUID) so it does not know what to do.

    Since you have Windows in MBR, you may just want to delete gpt backup.

    First backup partition table
    sudo sfdisk -d /dev/sda > parts_sda.txt

    Fixparts - Repair broken partition tables (not overlapping issues) & delete Stray gpt data from MBR drives
    http://ubuntuforums.org/showthread.php?t=1705325
    http://www.rodsbooks.com/fixparts/
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  3. #3
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    It is an UEFI system. I believe I initially had GPT partitions installed on this machine with Windows 7 and Ubuntu 12.04. I wanted to do a fresh Windows 8 install, so I deleted the GPT partition that Windows 7 used, and then also removed the prior Ubuntu 12.04 partition as well.

    I will review your suggestions and provide an update once I get home later today.

    Thank you.

  4. #4
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    Probably would have been better to stay with UEFI, but since that is new we all are learning how to work with that type of install.
    Not sure if Windows 8 would then want you to turn secure boot on. That I would liked to have known.
    But since you are now MBR, best just to clear backup gpt data.
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  5. #5
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    I have exactly the same problem. I use Ubuntu 12.10 though.
    Please let me know if you succeed.

  6. #6
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    Quote Originally Posted by DugieHowsa View Post
    It is an UEFI system.
    No it is not. It's one thing the board to have uefi support, it's completely different thing whether you are using it.

    I don't know about win8, but win7 only works on uefi with gpt table on the disk, and your disk clearly has msdos table. Hence, it's not uefi boot. Further more, for uefi the first partition on the disk is the EFI System partition and it's FAT32. Yours is NTFS.

    Since you already said the disk was gpt earlier, it probably got converted to msdos by windows. In such case windows doesn't delete the backup gpt table and linux can see this and gets confused.

    Use fixparts that oldfred mentioned which will remove the backup gpt table. After that you can install your dual boot but it will be in legacy (bios) mode, not uefi.

    @greg, if the situation is exactly the same, you can use fixparts too to get rid of the gpt leftovers.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 12.04 LTS 64bit & Windows 7 Ultimate 64bit

  7. #7
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    Yes, I tried it and the installation seems to succeeded. (I'm not sure about this bios stuff at all - maybe it's different on my computer).
    But I have not grub menu - I go straight into windows

  8. #8
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    Quote Originally Posted by greg606 View Post
    Yes, I tried it and the installation seems to succeeded. (I'm not sure about this bios stuff at all - maybe it's different on my computer).
    But I have not grub menu - I go straight into windows
    Now we are entering another topic so it's better that you open a new thread. Put the basic data in it, including whether you have one disk or more. With multiple disks maybe only the bootloader is on another disk. Try booting from another.

    In any case, don't keep replying here, open a new thread. And if you can, it's better to post the bootinfo in your post. You can get the bootinfo with:
    https://help.ubuntu.com/community/Boot-Repair

    PS. You can also use boot-repair for common boot fixes so you might give the Recommended Repair a go if you want.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 12.04 LTS 64bit & Windows 7 Ultimate 64bit

  9. #9
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    Re: Not seeing Windows 8 partitions when trying to install 12.04

    Thanks for the replies everyone. Originally, my system has efi support, as both Windows 7 and Ubuntu 12 had .efi files on the FAT32 partition, and both appeared as bootable options under system BIOS EFI Boot selector.

    I was able to remove the GPT partitions and create MBR partitions, so with regards to that, the issue was resolved.

    But what I was ultimately looking for was to have GPT support so that I could have more than the 4 partitions allowed by MBR.

    My systems firmware appears to have lost the EFI support, as I can only perform legacy (MBR) functions now. I am going to work with the PC manufacturer (HP) to see how I can get my hard drive and optical drive to appear again under "UEFI Supported Devices" again in the BIOS.

  10. #10
    Join Date
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    Ubuntu 12.04 Precise Pangolin

    Re: Not seeing Windows 8 partitions when trying to install 12.04

    The msdos partition table (also referred to as MBR) allows only 4 primary partitions, that's true.

    But you can also use 3 primary and 1 extended partition which contains many logical partitions. So, it's not impossible to have more than 4 partitions. The only thing is that 3 of them can be primary and the others need to be logical.

    Especially ubuntu has no problems working on logical partitions, so you can create them and use them.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 12.04 LTS 64bit & Windows 7 Ultimate 64bit

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