Public bug reported:

When trying the current daily install image for Kubuntu 14.04 I found
that when I tried to overwrite an old install that had ext4 on /dev/sda6
with a new one with btrfs on /dev/sda6 it would keep telling me that the
creation of /dev/sda6 had failed.

Looking at /var/log/syslog it's because mkfs.btrfs is detecting the
existence of an ext4 filesystem and refusing to overwrite it unless it
is passed the -f flag.

In the end I had to dd over the start of /dev/sda6 from /dev/zero to
enable the install to work.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.17.3
ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
Uname: Linux 3.12.0-7-generic x86_64
ApportVersion: 2.12.7-0ubuntu3
Architecture: amd64
CasperVersion: 1.336ubuntu1
CurrentDesktop: KDE
Date: Sun Jan  5 23:02:33 2014
InstallCmdLine: file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity 
initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140105)
MarkForUpload: True
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug trusty ubiquity-2.17.3

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https://bugs.launchpad.net/bugs/1266190

Title:
  partman fails to overwrite an already existing filesystem with btrfs

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