package firefox-locale-en 57.0.4+build1-0ubuntu0.14.04.1 failed to install/upgrade: package firefox-locale-en is already installed and configured

[valéry vignolles]

When I start a new session an error message occur. Furthermore I notice that mozilla firefox run slower than I was used to.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: firefox-locale-en 57.0.4+build1-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 4.4.0-108.131~14.04.1-generic 4.4.98
Uname: Linux 4.4.0-108-generic i686
AddonCompatCheckDisabled: False
ApportVersion: 2.14.1-0ubuntu3.27
AptdaemonVersion: 1.1.1-1ubuntu5.2
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: valery 2386 F.... pulseaudio
BuildID: 20180104113026
Channel: Unavailable
CrashReports:
 600:0:116:79791:2018-01-07 10:30:43.046727418 +0100:2018-01-07 10:30:44.046727418 +0100:/var/crash/firefox-locale-en.0.crash
 600:0:116:79771:2018-01-07 10:30:44.030727363 +0100:2018-01-07 10:30:44.010727363 +0100:/var/crash/firefox.0.crash
 600:0:116:79075:2018-01-07 10:30:43.526727378 +0100:2018-01-07 10:30:43.514727378 +0100:/var/crash/initramfs-tools-bin.0.crash
 640:1000:116:171302:2018-01-09 12:33:23.887904745 +0100:2018-01-09 17:34:23.032541176 +0100:/var/crash/_usr_bin_obex-data-server.1000.crash
Date: Sun Jan 7 10:30:44 2018
Dependencies:

DpkgHistoryLog:
 Start-Date: 2018-01-06 08:24:37
 Upgrade: initramfs-tools:i386 (0.103ubuntu4.9, 0.103ubuntu4.10), firefox:i386 (57.0.3+build1-0ubuntu0.14.04.1, 57.0.4+build1-0ubuntu0.14.04.1), libruby1.9.1:i386 (1.9.3.484-2ubuntu1.5, 1.9.3.484-2ubuntu1.6), initramfs-tools-bin:i386 (0.103ubuntu4.9, 0.103ubuntu4.10), firefox-locale-en:i386 (57.0.3+build1-0ubuntu0.14.04.1, 57.0.4+build1-0ubuntu0.14.04.1), firefox-locale-fr:i386 (57.0.3+build1-0ubuntu0.14.04.1, 57.0.4+build1-0ubuntu0.14.04.1), ruby1.9.1:i386 (1.9.3.484-2ubuntu1.5, 1.9.3.484-2ubuntu1.6)

 Start-Date: 2018-01-07 10:29:38
 Install: musescore:i386 (1.3+dfsg-1), musescore-soundfont-gm:i386 (1.3+dfsg-1, automatic), musescore-common:i386 (1.3+dfsg-1, automatic)
DuplicateSignature: package:firefox-locale-en:57.0.4+build1-0ubuntu0.14.04.1:package firefox-locale-en is already installed and configured
ErrorMessage: package firefox-locale-en is already installed and configured
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2017-09-15 (119 days ago)
InstallationMedia: Kubuntu 14.04.5 LTS "Trusty Tahr" - Release i386 (20160803)
IpRoute:
 default via 192.168.1.1 dev wlan0 proto static
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.15 metric 9
NoProfiles: True
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.7
 apt 1.0.1ubuntu2.17
RunningIncompatibleAddons: False
SourcePackage: dpkg
Title: package firefox-locale-en 57.0.4+build1-0ubuntu0.14.04.1 failed to install/upgrade: package firefox-locale-en is already installed and configured
UpgradeStatus: Upgraded to trusty on 2017-09-27 (107 days ago)
dmi.bios.date: 12/26/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0KCT5J
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA14:bd12/26/2013:svnDellInc.:pnLatitudeE5520:pvr01:rvnDellInc.:rn0KCT5J:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5520
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.