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I am trying to install Ubuntu10.10 64bit. I just installed Windows 7 64bit moments ago. My drive is currently partitioned like so:

100MB Boot partition (automatically made by windows 7 installer) 390GB Windows partition ~1.6TB free space

When I go through the Ubuntu installer it does not give me the option to install alongside another operating system. My only options are to use the entire disk or to specify partitions manually. When I chose to specify partitions manually it tells me that the drive is all free space!

Windows is still booting and behaving normally, and I had not doing anything in Windows yet (had simply installed, booted for first time, then immediately restarted). I am even able to mount the windows partition within Ubuntu Live CD, and see it in the disk viewer (not gparted). Gparted in Ubuntu Live CD again reports no partitions, all free space.

Not sure what to do :S. I have installed Windows7 alongside Ubuntu countless times, even Ubuntu 10.10.

Thank you very much for your help :).

Edit: I tried adding a partition through Disk Utility since it identifies the parititions; it failed. However gparted now identifies the free sapces as a NTFS partition. I used to have ubuntu as my only O/S before I wiped to add windows 7. I wonder if there is some remnant of the old partition table left over that the windows installer wasn't wiping over, so gparted was getting confused on where partitions started/ended.

I am trying to create the partition table/partitions with gparted now and see if that helps.

I got to install windows 7 first unfortunately since I can never figure out how to repair grub once windows has stomped on it.

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In the future, please edit or comment when you want to add additional information. If you don't, people may assume the question has an answer and might not read it. I've cleaned. –  Oli Feb 23 '11 at 9:52
    
Can you post the output of sudo fdisk -l and sudo parted -l? –  arrange Feb 23 '11 at 15:17
    
Hi, sorry I did not see the edit button! –  user11321 Feb 23 '11 at 21:09
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1 Answer

If there is a remnant of the old partition table left then it's easy to get rid of it. Just run a dd like so:

dd if=/dev/random of=/dev/sda bs=1 count=512

Only run this if you are sure you want to erase all partitions and start over. "sda" is the harddrive you're working with.

If you do this you will have to reinstall Windows 7 again. I'd recommend creating the partitions with the Ubuntu Live CD, that way the Windows installer doesn't create the 100MB System Partiton anymore, and you can be sure that the partitions are actually there. Good luck.

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I ended up formatting using gparted and letting it build the partition map, seemed to work! It must have been that Windows left something behind when it formatted. –  user11321 Feb 23 '11 at 21:10
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