iPhone unhandled lockdown error (-20)

[Nicholas Burmeister]

After unlocking phone and establishing trust, the iPhone 5S will not pair with Linux. I get the repeated unhandled lockdown error -20.

I have tried the solution presented here:

http://ubuntuforums.org/showthread.php?t=2228772

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.47
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: nick 1949 F.... pulseaudio
 /dev/snd/controlC1: nick 1949 F.... pulseaudio
CurrentDesktop: X-Cinnamon
Date: Fri Oct 10 08:33:07 2014
HibernationDevice: RESUME=UUID=7adf6c6e-9871-44ba-a9d3-9da64be6b483
InstallationDate: Installed on 2014-02-05 (246 days ago)
InstallationMedia: Linux Mint 16 "petra" - Release amd64 20131126
IwConfig:
 eth0 no wireless extensions.

 eth1 no wireless extensions.

 lo no wireless extensions.
MachineType: Dell Inc. OptiPlex 960
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=5e85d7ea-15ea-44d2-ae58-f8ce6766a9cc ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-24-generic N/A
 linux-backports-modules-3.13.0-24-generic N/A
 linux-firmware 1.127.7
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/29/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0Y958C
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd04/29/2009:svnDellInc.:pnOptiPlex960:pvr:rvnDellInc.:rn0Y958C:rvrA00:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 960
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[da6930p (da6930p)]

It's 2015-02-28 on Ubuntu 14.04 all up to date packages why are we getting still this error?

[Marco Salini (x-l2unchpad-x)]

I confirm I am getting this error on the following system:

Linux Mint 17 (qiana)
3.13.0-24-generic #46-Ubuntu x86_64

I have installed all the requested packages:
- ifuse
- libimobiledevice4
- libimobiledevice-utils
- gvfs
- libtasn1-3

I have also "sudo chmod 777 /var/lib/lockdown"

I have an iPhone 4s with iOS 8.4 installed.

Thanks

Marco

[Rufus (balaenoptera-rufus)]

My iPhone 6 with iOS 8.4 is also affected by this bug on Linux Mint 17 Mate. Upgrading to Mint 17.3 does not help.
Interestingly the bug does not exist in Linux Mint 15, and also not in Linux Mint Debian Edition 2 (Betsy) Mate. I can connect my iPhone without any issue to Mint 15 and LMDE 2.
What is the difference? Please help.
I tried every possible solution I could find on the internet. Nothing changes.