[Bug 1265432] Re: installer cannot reformat btrfs partition

[Paul Gauret]

Faced the same bug in a different context.

I was trying to create a kvm vm on my system using btrfs on top of a lvm
volume and was getting the same error message. This appears to be caused
by the underlying lvm volume having previously contained an ext4
filesystem not being zeroed out.

Fix for me was simply to zero out the volume and re-launch the
installer.

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https://bugs.launchpad.net/bugs/1265432

Title:
  installer cannot reformat btrfs partition

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  I'm trying to install Ubuntu 13.10, asking it to reformat an existing
  btrfs partition to use for installation.

  The installer reports the following error:

  partman: /dev/sdb1 appears to contain an existing filesystem (btrfs).
  partman: Error: use the -f option to force overwrite.

  Of course, reformatting a btrfs partition is pretty silly; most times
  it's best to create and use a new subvolume.    Either way it
  shouldn't fail...

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