Comment 139 for bug 1080701

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.