ubiquity crashed with IndexError in on_region_combo_changed()

I can reproduce this bug when navigating through the different steps multible times

I had this problem when I went back to the first step of the installer, and right when I clicked update this installer it triggered the error.

There was one time when I started installing, and as soon as I got to the point where I could click "Install", Ubiquity crashed with this same bug. I assume it's an issue that certainly needs to be fixed in time for Lucid's final release, considering it is potentially fatal.

-Kenny Strawn

Also seen here on a Lenovo S-10 Netbook while doing an OEM install.

1.5GB Ram
1.6GHz Atom Proc
16GB SSD drive

I`ve tested the build from 27.02.2010 and the problem is fixed. Thanks.

I experienced this bug today on the latest live cd... i don't know that the problem is fixed

On Lucid i386 20100321
I start installation, but at the configuring clock popup i see that the internet connection was out, then click back from geo/localization window then click on forward at the first window then apport start, but ubiquity continue his work correctly.

Switching back and forth on the regions seems to be what is causing this bug.
Amd Athlon II x3 using 32bit version

confirming the issue on beta2 if you go back from the timezone selection to the language one and click next there

Sebastien Bacher schrieb:

> confirming the issue on beta2 if you go back from the timezone selection
> to the language one and click next there
>
>
>
Correct. Thats what I did.

This bug was fixed in the package ubiquity - 2.2.17

---------------
ubiquity (2.2.17) lucid; urgency=low

  [ Mario Limonciello ]
  * Remove unused install_bottom_eb from GTK frontend's install_window.

  [ Evan Dandrea ]
  * Catch invalid iterators in on_region_combo_changed (LP: #521851).
  * Don't let not being able to talk to the system bus crash the entire
    language page.
  * Translate the yes and no buttons on the quit dialog in the KDE
    frontend (LP: #561876).
  * Update translations from Launchpad.
  * Automatic update of included source packages: base-installer
    1.103ubuntu7, choose-mirror 2.29ubuntu3, partman-base 139ubuntu4,
    partman-basicfilesystems 63ubuntu4, tzsetup 1:0.26ubuntu8.

  [ Colin Watson ]
  * Skip copy_wallpaper_cache when running as oem-config.
  * Update finish-install.d/07oem-config-user for new location of KDE's
    oem-config-prepare .desktop file (LP: #557309).
  * Restore translations for oem-config-check and oem-config-udeb, lost in
    oem-config merge.
  * Display simple progress feedback using debconf-apt-progress while
    removing oem-config (LP: #558593).
  * Write locale-gen output from ubiquity-dm to /var/log/installer/dm rather
    than to the console.
  * Increase kernel flush times (dirty_writeback_centisecs to 3000, and
    dirty_expire_centisecs to 6000) during bulk data copying. Surbhi
    Palande suggests that this should make it easier for the kernel to pack
    blocks contiguously, speeding up ureadahead after installation.

  [ Amichai Rothman ]
  * Fix hang unless mouse is moved (LP: #556376)
 -- Evan Dandrea <email address hidden> Wed, 14 Apr 2010 17:38:36 +0100