Kubuntu 15.10 installer crash on AMD x86 desktop system

[Vaidy]

kubuntu@kubuntu:~$ ubuntu-bug ubiquity
ERROR: hook /usr/share/apport/package-hooks/source_ubiquity.py crashed:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 197, in _run_hook
    symb['add_info'](report, ui)
  File "/usr/share/apport/package-hooks/source_ubiquity.py", line 60, in add_info
    syslog = report['UbiquitySyslog'].decode('UTF-8')
AttributeError: 'str' object has no attribute 'decode'
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
kbuildsycoca4 running...
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.sheet.binary.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.addin.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.sheet.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.presentation.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-word.template.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.template.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.template.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-word.document.macroEnabled.12"
kbuildsycoca4(4124) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.slide.macroEnabled.12"

(process:4145): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed

(firefox:4145): Gtk-WARNING **: Theme directory apps/system-power-actions of theme breeze has no size field

(firefox:4145): Gtk-WARNING **: Theme directory apps/toolbar of theme breeze has no size field

(firefox:4145): Gtk-WARNING **: Theme directory categories/kickoff-menu-tabs of theme breeze has no size field

Segmentation fault (core dumped)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubiquity 2.21.29
ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
Uname: Linux 4.2.0-7-generic x86_64
ApportVersion: 2.18.1-0ubuntu1
Architecture: amd64
CasperVersion: 1.364
CurrentDesktop: KDE
Date: Sat Sep 12 11:00:51 2015
LiveMediaBuild: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150912)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brian Murray (brian-murray)]

From UbiquitySyslog.txt:

Sep 12 10:56:43 kubuntu ubiquity[2356]: Exception in KDE frontend (invoking crash handler):
Sep 12 10:56:43 kubuntu ubiquity[2356]: Traceback (most recent call last):
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/bin/ubiquity", line 649, in <module>
Sep 12 10:56:43 kubuntu ubiquity[2356]: main(oem_config)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/bin/ubiquity", line 635, in main
Sep 12 10:56:43 kubuntu ubiquity[2356]: install(query=options.query)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/bin/ubiquity", line 264, in install
Sep 12 10:56:43 kubuntu ubiquity[2356]: wizard = ui.Wizard(distro)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py", line 212, in __init__
Sep 12 10:56:43 kubuntu ubiquity[2356]: mod.ui = mod.ui_class(mod.controller)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 221, in __init__
Sep 12 10:56:43 kubuntu ubiquity[2356]: self._setup_page()
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 227, in _setup_page
Sep 12 10:56:43 kubuntu ubiquity[2356]: self.nmwidget = nmwidgets.NetworkManagerWidget()
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py", line 364, in __init__
Sep 12 10:56:43 kubuntu ubiquity[2356]: self.view = NetworkManagerTreeView(self._on_state_changed)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py", line 228, in __init__
Sep 12 10:56:43 kubuntu ubiquity[2356]: self.wifi_model = NetworkManager(model, QtQueuedCaller, state_changed)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/ubiquity/nm.py", line 119, in __init__
Sep 12 10:56:43 kubuntu ubiquity[2356]: self.start(state_changed)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/ubiquity/nm.py", line 137, in start
Sep 12 10:56:43 kubuntu ubiquity[2356]: self.build_cache()
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/ubiquity/ubiquity/nm.py", line 225, in build_cache
Sep 12 10:56:43 kubuntu ubiquity[2356]: devices = self.manager.GetDevices()
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 70, in __call__
Sep 12 10:56:43 kubuntu ubiquity[2356]: return self._proxy_method(*args, **keywords)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
Sep 12 10:56:43 kubuntu ubiquity[2356]: **keywords)
Sep 12 10:56:43 kubuntu ubiquity[2356]: File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
Sep 12 10:56:43 kubuntu ubiquity[2356]: message, timeout)
Sep 12 10:56:43 kubuntu ubiquity[2356]: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.AccessDenied: Rejected send message, 7 matched rules; type="method_call", sender=":1.17" (uid=999 pid=2356 comm="/usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity --") interface="(unset)" member="GetDevices" error name="(unset...

[Wellington Torrejais da Silva (wellington1993)]

Maybe Related: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1762228 #1762228