[Bug 1064151] Re: ubiquity crashed with TypeError in partman_dialog(): 'NoneType' object is not subscriptable

[Cliff]

I also ran into this problem (Mint 17.1 64bit Mate live DVD, single core AMD 64 bit processor 4gig RAM).
nodmraid boot option did not fix it (before and after --)
nodmraid option to ubiquity did not fix it (ubiquity refused to run)

I'm not an expert on this, but there are software and hardware RAID
controllers and my Windows may actually use something that is
technically RAID.

Make a backup.  A good habit to get into.  I keep a few large USB drives
for this.  Move your large files (videos, ISO's, etc.) off to the backup
drive and use a clonezilla live CD to back up your whole hard drive.  I
go a step farther after that and use gparted live CD to shrink my older
OS's because they won't be used much any more and make another backup
after that.

If you are not actually running a RAID setup then one work around listed elsewhere is to erase the RAID metadata.  I could not find any statement that said that was always perfectly safe (I suspect that it is perfectly safe because the metadata must pass strong checksum requirements).  Use this from a terminal prompt to find which of your drives have RAID on them:
  sudo dmraid -r -c

Then use this to erase dmraid metadata (replace /dev/sda with something else as needed):
  sudo dmraid -r -E /dev/sda

The previous is probably the best way for most people, but I was afraid
of borking my Windows install as it was not my computer and I didn't
know if it might have had software RAID in Windows.

Of course if you are simply reusing an old drive and just want to
completely erase everything that is on it you can just wipe the whole
thing with dd or ddrescue or dd_rescue and that will get rid of any RAID
signatures.

As another option that doesn't erase the RAID metadata, I worked around the problem by starting the live DVD normally, starting a terminal and entering:
  sudo apt-get purge dmraid
then running the Linux installer without rebooting in between.

Note that this only temporarily removes dmraid from the live DVD
environment.  It is back again after rebooting the live DVD.

The new installed bootloader did not include my other operating systems because of the same dmraid issues, so after booting the newly installed Linux OS I had to bring up a terminal and enter these:
  sudo apt-get purge dmraid
  sudo update-grub

Also note that your grub configuration will have 'nodmraid' configured
in /etc/default/grub so you won't be able to use RAID without changing
that and running sudo update-grub, but most newbies don't need Linux
RAID.

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https://bugs.launchpad.net/bugs/1064151

Title:
  ubiquity crashed with TypeError in partman_dialog(): 'NoneType' object
  is not subscriptable

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Have tried multiple drives 500GB is main attempt, 250GB, and 120GB.
  Have tried pre-configuring partitions both Linux and Windows 7, but no
  matter what disk drive or configuration they do not show up as adrives
  available to install onto in the tool.

  However, what does show in the tools as active partitions, are the two
  partitions of my Windows  7 drive.

  Also tried SATA port position for all drives.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: ubiquity 2.12.5
  ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
  Uname: Linux 3.5.0-15-generic x86_64
  ApportVersion: 2.5.2-0ubuntu4
  Architecture: amd64
  CasperVersion: 1.324
  Date: Tue Oct  9 01:46:49 2012
  ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  InterpreterPath: /usr/bin/python3.2mu
  LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120926)
  ProcCmdline: /usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity --greeter --only
  ProcEnviron: Error: [Errno 13] Permission denied: '/proc/3085/environ'
  PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', '--greeter', '--only']
  SourcePackage: ubiquity
  Title: ubiquity crashed with TypeError in partman_dialog(): 'NoneType' object is not subscriptable
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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