Unhandled exception -- cannot find partition instance sdb4

[PTSWhite]

Repeated attempts to install Pardus 2011.2 have failed on my Dell E4310 laptop
(i5 processor with 4GB RAM, two 500GB hard drives, and Intel graphics). The
laptop was a dual-boot Win7-Mint11 machine. I deleted the Mint11 partition and
attempted to install Pardus and was met with the Unhandled exception -- cannot
find partition instance sdb4 error message (backtrace below). Installation checksum was verified with MD5sum.

As a test I started both Ubuntu 11.04 and Mint11 installs through the partition
locating phase and both identified the partitions and 107GB of unallocated
space intended for Pardus. I aborted both test installs (because i REALLY want
Pardus on both my machines).

Reproducible: Always

Steps to Reproduce:
Steps taken:
1. Run Pardus installation from CD
2. Validate packages
3. Attempt identification of hard drives (fail)
Actual Results: 
cannot find partition instance sdb4
<class 'yali.storage.devices.partition. PartitionError'>

Backtrace:
   File "/usr/lib/python2.7/site-packages/yali/gui/ScrDateTime.py", line 221,
in startStorageInitialize
   ctx.storageInitialized=yali.storage.initialize(ctx.storage, ctx.interface)
  File "/usr/lib/python2.7/site-packages/yali/storage/_init_.py", line 35, in
initialize
    storage.reset()
  File "/usr/lib/pythin2.7/site-packages/yali/storage/_init_.py", line 316, in
reset
     self.addDevice(device)
  File "/usr/lib/python2.7/site-packages/yali/storage/devicetree.py", line
1617, in populate
    self.addDevice(device)
  File "usr/lib/python 2.7/site-packages/yali/storage/devicetree.py", line
1048, in addDevice
     device-self.addPartiton(info)
  File "/usr/lib/python2.7/site-packages/yali/storage/devices/devicetree.py",
line 938, in addPartition
      exists=True, parents=[disk])
  File "/usr/lib/python2.7/site-packages/yali/storage/devices/partition.py",
line 102, in_init_
      raise PartitionError("cannot find parted partition instance", self.name)

[PTSWhite]

SUCCESS!

Based on the content of another post in this forum I decided to remove the laptop's second hard drive. Voila, Pardus installed just fine.

Happily working with Pardus!

-Steve

[owiknowi]

hi PTSWhite,

just curious: what was the partition layout when both disk were present?
usual one disk is set as master (sda) and the second as slave (sdb). if windos is present, that partition needs a so called boot flag (done buy windos during its installation or you can do it manually with a partitioning tool like parted magic.