[Bug 1768617] [NEW] Installer fails to remove old partitions

[Diego Reyes]

Public bug reported:

When installing Ubuntu 18.04-server over an old installation, after selecting/confirming 'whole disk' the installer fails to remove the old partitions and aborts the process.
Tested on two different machines both with previous Ubuntu 16.04 installations.
One workaround is to write zeros to the beginning of the target disk.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bionic

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Title:
  Installer fails to remove old partitions

Status in debian-installer package in Ubuntu:
  New

Bug description:
  When installing Ubuntu 18.04-server over an old installation, after selecting/confirming 'whole disk' the installer fails to remove the old partitions and aborts the process.
  Tested on two different machines both with previous Ubuntu 16.04 installations.
  One workaround is to write zeros to the beginning of the target disk.

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