KeyError: 'method_choices' when configuring btrfs partitions

[Blair Zajac]

Doing a fresh kubuntu precise install with the following setup:

VirtualBox 4.0.14
/dev/sda 32 GB
  /dev/sda1 384 MB btrfs
  /dev/sda2 2 GB swap
  /dev/sda3 max btrfs
/dev/sdb 32 GB
  /dev/sda1 384 MB btrfs
  /dev/sda2 2 GB swap
  /dev/sda3 max btrfs

I would jump into a shell, run fdisk and then create the partitions then format them:

mkfs.btrfs -d raid1 -m raid1 /dev/sda1 /dev/sdb1
mkfs.btrfs -d raid1 -m raid1 /dev/sda3 /dev/sdb3

Then launching the installer and trying to configure the installer to use /dev/sda1 for /boot and /dev/sda3 for / gets the following error. I leave /dev/sdb* alone but btrfs will mirror the data there.

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartMan.py", line 429, in on_edit_clicked
    self.partman_edit_dialog(devpart, partition)
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartMan.py", line 271, in partman_edit_dialog
    for script, arg, option in partition['method_choices']:
KeyError: 'method_choices'

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.2
ProcVersionSignature: Ubuntu 3.1.0-2.3-generic 3.1.0
Uname: Linux 3.1.0-2-generic x86_64
ApportVersion: 1.25-0ubuntu1
Architecture: amd64
CasperVersion: 1.288
Date: Thu Nov 3 19:12:09 2011
LiveMediaBuild: Kubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111103)
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Blair Zajac (blair)]

I get a similar error trying to do a normal Ubuntu install from the live desktop ISO.

[Robert Roth (evfool)]

This might have something to do with bug #885654, as the cause of both is method_choices KeyError, only one is in the GTK Frontend, and the other one in the KDE one, so it's a problem in the backend.