Same crash here with Ubuntu 9.04 Live CD install.
How to reproduce (at least on my system):
start livecd and either select to install a new system or to run a live cd.
If the latter, then start ubiquity manually by clicking the "install" shortcut
on the desktop.
Set language, keyboard, time zone, ... and don't select any OS'es when offered
to migrate settings from other OS'es on you system.
At the end click finish to start the installation.
The installation will start formatting/copying files/... and finally crash with
the error mentioned above.
Result: an unusable, unbootable Ubuntu installation !
Apparently the problem has to do with the migration of settings form other
OS'es.
While I selected to not migrate any settings, it appears that it is still
trying to do so during installation.
How do I know ?
Because when you start ubiquity from a terminal window on the live cd with the
following options:
ubiquity --no-migration-assistant
The installation finishes without any errors.
Actually I don't know why I still choose to download the live cd, as it has
never worked for me.
Each time a new Ubuntu version is released and I try to install through the
live cd, something doesn't work and
in the end I always have to download the alternate install cd.
This time I was rather *lucky* that I found a workaround.
It's really incomprehensible that Ubuntu releases such crappy
installation cd's
--
ubiquity crashed with ValueError in command()
https://bugs.launchpad.net/bugs/298509
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