[Bug 1080701] Re: After 'Preparing to install Ubuntu' screen, raring installation hangs

[Hugh Kernohan]

I suffered this problem when shifting from 12.04 to a clean install of
13.04 with twin hard disks and a dual-boot to Windows.  The 'Disk Setup'
stage refused to recognise existing partitions or free space.  Partman
usually exited with error code 141 but sometimes crashed.  I lost three
days days of my life and became intimately acquainted with testdisk.

Eventually I tracked the fault to the existence of dmraid metadata on
the two hard drives.  It was not shown up by testdisk but was listed by
dmraid.  Using **dmraid -rE** to erase the unnecessary metadata meant
that the ubiquity install routine functioned normally.

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Title:
  After 'Preparing to install Ubuntu' screen, raring installation hangs

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