: Sub-process /usr/bin/dpkg returned an error code (1)

[James]

After xubuntu standard update it failed with a libqtcore4 error
tried terminal sudo apt-get install -f
got another error

in synaptic Package Manager did a update

 I got this error :

(synaptic:3987): GLib-CRITICAL **: g_child_watch_add_full: assertion 'pid > 0' failed
(Reading database ... 893340 files and directories currently installed.)
Preparing to unpack .../libqtcore4_4%3a4.8.5+git192-g085f851+dfsg-2ubuntu4.1_amd64.deb ...
Unpacking libqtcore4:amd64 (4:4.8.5+git192-g085f851+dfsg-2ubuntu4.1) over (4:4.8.5+git192-g085f851+dfsg-2ubuntu4) ...
dpkg: error processing archive /var/cache/apt/archives/libqtcore4_4%3a4.8.5+git192-g085f851+dfsg-2ubuntu4.1_amd64.deb (--unpack):
 trying to overwrite shared '/etc/xdg/Trolltech.conf', which is different from other instances of package libqtcore4:amd64
Errors were encountered while processing:
 /var/cache/apt/archives/libqtcore4_4%3a4.8.5+git192-g085f851+dfsg-2ubuntu4.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:

system still trying to update it seems like it installs the correct Package I think it's to do with the removal of the old that the problem comes in

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libqtcore4 4:4.8.5+git192-g085f851+dfsg-2ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-54.91-generic 3.13.11-ckt20
Uname: Linux 3.13.0-54-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Jun 6 14:05:11 2015
InstallationDate: Installed on 2013-03-06 (822 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: qt4-x11
UpgradeStatus: Upgraded to trusty on 2014-05-16 (386 days ago)

[Launchpad Janitor (janitor)]

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

[draco (draco31-fr)]

Hi,

Same problem today for me.
To solve this, I need to manually backup the file :
  sudo mv /etc/xdg/Trolltech.conf{,.old}
Then fix the update :
  sudo apt-get install -f

After this, the file is not created, so I don't understand why dpkg complains about the overwrite of the file.
If needed, you could rename the backup to restore the file :
  sudo mv /etc/xdg/Trolltech.conf{.old,}