[Bug 416499] Re: Installer doesn't recognize Windows 7 NTFS partition properly

[Hendrik Knackstedt]

I am seeing this problem when trying to install Ubuntu 12.04.2 LTS on a
Lenovo ThinkCenter. I have been installing two similar PCs before that
did not have this problem.

This installer just says the whole disk is empty but there is already
Windows 7 on it and Ubuntu does show the partitions in Nautlius after
canceling the installer.

The only difference between the 2 working PCs and the one that is not working is:
For the first 2 Windows 7 was installed on the whole disk so I had to resize existing partitions. That worked and I could install Ubuntu on the so-created free space.

For the other PC I recently installed Windows 7 so I chose partition
size a bit smaller to leave some free space on the disk for Ubuntu that
does not contain a partition. Maybe this free space does cause the
problem?

** Also affects: ubiquity
   Importance: Undecided
       Status: New

** Tags added: precise

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Title:
  Installer doesn't recognize Windows 7 NTFS partition properly

Status in Ubiquity:
  New
Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  Details are in this thread, with a screenshot of the installer at the
  partitioning step: http://ubuntuforums.org/showthread.php?t=1243160

  The 100MB boot partition is recognized as a Windows Vista partition,
  but the primary NTFS partition that Windows 7 is installed in is only
  recognized as /dev/sda2.  Even though there was 117GB of free space
  available on the drive, if I chose "Use the largest contiguous free
  space", it would only try to use 2.5GB for Ubuntu's ext3 partition.
  If I used the slider, it would allow me to use more than the available
  free space (perhaps by resizing the NTFS partition?  I did not try
  it), but it made me worry that the NTFS partition would not be
  respected and possibly corrupted.

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