[Bug 1014888] [NEW] Ubuntu Update Manager hangs when trying to upgrade anything

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In the last few days the Update Manager graphical tool hangs 100% of the
time.

It starts and shows the updates that are ready for download and
installation and allows you to click on "Install Updates". When I do so,
everything is grayed out and the mouse shows the wait pointer, as usual,
but then nothing happens. The first time I waited just in case it would
have been a timed something issue. Nothing happened even after 1h or so.

Then I finally tried starting update-manager from my command line and
got the errors reported below.

I recall that python was upgraded not too long ago. Most certainly just
before this started happening. Possibly the source of the problem? Any
idea?

IMPORTANT NOTE:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrate

work just fine. Only the Update Manager GUI fails.

Also, I get these as "no longer required" which in 99% of the time are
still in use (from my experience,) but maybe one of these could be the
culprit?

The following packages were automatically installed and are no longer required:
  nspluginwrapper python-configglue libicu42 gir1.2-dbusmenu-glib-0.4 libappindicator0.1-cil libset-intspan-perl gir1.2-soup-2.4 gir1.2-unity-3.0 w3c-dtd-xhtml libconfig-general-perl wwwconfig-common w3-dtd-mathml gir1.2-dee-0.5 python-ubuntuone-control-panel libgmime2.4-cil


update-manager 
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 474, in _inline_callbacks
    result = gen.send(result)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1580, in _run_transaction_helper
    daemon = get_aptdaemon(self.bus)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1654, in get_aptdaemon
    False),
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 474, in _inline_callbacks
    result = gen.send(result)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1580, in _run_transaction_helper
    daemon = get_aptdaemon(self.bus)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1654, in get_aptdaemon
    False),
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 472, in _inline_callbacks
    result = gen.throw(result.type, result.value, result.traceback)
  File "/usr/lib/python2.7/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py", line 50, in commit
    downgrade, defer=True)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1


Thank you.
Alexis

** Affects: aptdaemon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: update-manager
-- 
Ubuntu Update Manager hangs when trying to upgrade anything
https://bugs.launchpad.net/bugs/1014888
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