aptdaemon kills all my processes 10 minutes after starting an upgrade

Binary package hint: aptdaemon

$ lsb_release -rd
Description: Ubuntu karmic (development branch)
Release: 9.10

$ apt-cache policy aptdaemon
aptdaemon:
  Installiert: 0.10+bzr258-0ubuntu1
  Kandidat: 0.10+bzr258-0ubuntu1
  Versions-Tabelle:
 *** 0.10+bzr258-0ubuntu1 0
        500 http://de.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

I started the upgrade process through update-manager.
When the upgrade takes longer than 10 minutes, aptdaemon kills all processes of the current user exactly 10 minutes after the upgrade was started.

Furthermore I found the following messages in /var/log/syslog:
Oct 8 18:45:56 r00t-desktop AptDaemon.Worker: CRITICAL: Killing child since timeout of 600 s
Oct 8 18:45:56 r00t-desktop modem-manager: Caught signal 15, shutting down...
Oct 8 18:45:56 r00t-desktop avahi-daemon[968]: Disconnected from D-Bus, exiting.
Oct 8 18:45:56 r00t-desktop avahi-daemon[968]: Got SIGQUIT, quitting.
Oct 8 18:45:56 r00t-desktop avahi-daemon[968]: Leaving mDNS multicast group on interface eth1.IPv4 with address 192.168.10.226.
Oct 8 18:45:56 r00t-desktop NetworkManager: <info> disconnected by the system bus.
Oct 8 18:45:56 r00t-desktop console-kit-daemon[1086]: WARNING: no sender#012
Oct 8 18:45:56 r00t-desktop NetworkManager: no sender
Oct 8 18:45:56 r00t-desktop init: Disconnected from system bus
Oct 8 18:45:56 r00t-desktop init: dbus main process ended, respawning
Oct 8 18:45:56 r00t-desktop init: avahi-daemon main process (968) terminated with status 255
Oct 8 18:45:56 r00t-desktop init: avahi-daemon main process ended, respawning
Oct 8 18:45:56 r00t-desktop init: network-manager main process (1236) terminated with status 1
Oct 8 18:45:58 r00t-desktop dbus-daemon: Reloaded configuration
Oct 8 18:46:01 r00t-desktop gdm-simple-slave[23101]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
Oct 8 18:46:01 r00t-desktop acpid: client 1337[108:115] has disconnected
Oct 8 18:46:01 r00t-desktop acpid: client 1299[0:0] has disconnected
Oct 8 18:46:01 r00t-desktop acpid: client connected from 23102[0:0]
Oct 8 18:46:01 r00t-desktop bonobo-activation-server (r00t-23123): could not associate with desktop session: Failed to connect to socket /tmp/dbus-CDDVovhxzn: Connection refused
[...]

/var/log/apt/term.log says:
Log started: 2009-10-08 18:35:55
[...]
(Lese Datenbank ... 226965 Dateien und Verzeichnisse sind derzeit installiert.)
Vorbereiten zum Ersetzen von linux-image-2.6.31-12-generic 2.6.31-12.40 (durch .../linux-image-2.6.31-12-generic_2.6.31-12.41_amd64.deb) ...
Done.
Entpacke Ersatz für linux-image-2.6.31-12-generic ...
Running postrm hook script /usr/sbin/update-grub.
[...]
Richte mesa-utils ein (7.6.0-1ubuntu1) ...
Verarbeite Trigger für libc-bin ...
ldconfig deferred processing now taking place
Log ended: 2009-10-08 18:46:23

Now some guesses:
I think that the bug must be in the class DaemonInstallProgress in progress.py and that child_pid has to be set correctly since it is only initialised with 0. Furthermore last_activity should be updated properly as it is only updated on start, when start_time is also updated.

ProblemType: Bug
Architecture: amd64
Date: Thu Oct 8 19:33:31 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: fglrx
Package: aptdaemon 0.10+bzr258-0ubuntu1
PackageArchitecture: all
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-12.41-generic
SourcePackage: aptdaemon
Uname: Linux 2.6.31-12-generic x86_64
XsessionErrors:
 (gnome-settings-daemon:2593): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:2593): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:2678): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:2743): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed