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I have recently installed Windows 7 on my laptop with 320 GB HD. Then, I made a partition so now I have 2 primary and 3 logical partitions (all NTFS). I want to install Ubuntu 12.10 so I used ube and Ubuntu 12.10 live. But problem is whenever I try to install Ubuntu from pen drive, it shows that there are no partitions so it wants to partition the whole hard disk.

I searched on web but didn't find suitable a solution. My question is how can I install Ubuntu in this case?

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    Can you add the output of sudo fdisk -l to your question?
    – Mitch
    Jul 20, 2013 at 14:02

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This symptom is most often caused by one of two problems:

  • Leftover RAID data -- If the disk was used in a RAID setup (which is sometimes the case even on single-disk setups, depending on your firmware settings), it may contain RAID data that will confuse libparted, the partitioning library used by the Ubuntu installer. Typing sudo dmraid -E -r /dev/sda will usually correct this problem. Do this only if you're positive that you're not actively using RAID on the disk, though; if Windows is using the RAID setup, this command will cause serious problems!
  • Damaged partition table -- Even minor damage to a partition table caused libparted to flake out. Most such problems can be fixed by my FixParts program. The Web page describes details of its use. On occasion, problems will need to be corrected in some other way, but more information (like the fdisk output that Mitch has requested) is necessary to diagnose the problem.
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