Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a 1TB drive and installed Windows 7 on a 128GB partition.

When I now try to install Ubuntu 11.04 it does not recognize the Windows partition but offers the complete 1TB drive to install Ubuntu on instead. It displays:

enter image description here

However, in the Ubuntu Disk Utility the Windows partitions are recognized.

enter image description here

What do I need to do in order for Ubuntu to recognize the Windows 7 partition and install Ubuntu as a dual boot?

Response to comments

The following commands were executed and the results are shown below:

fdisk -l

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk 
doesn't support GPT. Use GNU Parted.

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x34a38165

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      102400    7  HPFS/NTFS
Partition 1 does not end on cylinder boundary.
/dev/sda2              13       16318   130969600    7  HPFS/NTFS

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x14a714a6

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       60801   488384001   83  Linux

parted -l

Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0
has been opened read-only.
Error: /dev/sr0: unrecognised disk label                                  
share|improve this question
That is very strange. Can you provide more details? The installer does recognize NTFS and I haven't come across any problems with it. – Jo-Erlend Schinstad Sep 18 '11 at 13:33
Can you post the output of these two commands (list of partitions)? sudo fdisk -l and sudo parted -l – arrange Sep 18 '11 at 13:52
@arrange See question edit... – Woltan Sep 18 '11 at 15:12
Installer should be able to read a GPT partition table, so it looks like there is an error/inconsistency there. fixpart could fix it, but I don't have any experience with it myself... – arrange Sep 18 '11 at 15:29
up vote 2 down vote accepted

I can proudly announce that I now have a working Windows 7 and Ubuntu 11.04 running.

fixparts actually did the trick:

Download fixparts and run it with

sudo fixparts /dev/sda

fixparts then wants to know if it should Erase GPT data which I desperately did, and apparently repaired the partitions.

Ubuntu was then able to find the windows partition and installation worked like a charm.

Thx to arrange for the hint!

share|improve this answer

protected by Community Sep 7 '12 at 23:41

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged or ask your own question.