Startup with iPhone plugged in causes inability to logout

[Aurosutru]

In 14.04 startup with an iPhone 3G plugged in causes several problems. Changes to Unity made with Unity Tweak Tool are not recognized after such a startup, and attempting to logout hangs after the desktop icons are erased and only the desktop background remains. Startup without the iPhone plugged into a usb port works fine, as does operation when plugging in the iPhone after startup.

The iPhone is jail-broken and is set to tether. Synaptic shows only libplist1, libimobiledevice, usbmuxd and libusbmuxd2 installed related to iPhones.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libimobiledevice4 1.1.5+git20140313.bafe6a9e-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jul 30 06:10:49 2014
InstallationDate: Installed on 2014-01-11 (199 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109)
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: libimobiledevice
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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