package unity 7.4.0+16.04.20160715-0ubuntu1 failed to install/upgrade: package is in a very bad inconsistent state; you should reinstall it before attempting a removal

[Clement Yap]

I have no idea but it did not go smoothly after upgrading to 16.04 LTS after 12.XX.
Now it my seem OK.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160715-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic i686
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.5
AptOrdering:
 ubuntu-desktop: Remove
 unity: Purge
 NULL: ConfigurePending
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Wed May 24 22:51:12 2017
DistUpgraded: 2016-08-07 22:03:13,539 DEBUG icon theme changed, re-reading
DistroCodename: xenial
DistroVariant: ubuntu
DpkgHistoryLog:
 Start-Date: 2017-05-24 22:51:11
 Commandline: /usr/sbin/synaptic
 Requested-By: embeddedubuntu (1000)
 Remove: ubuntu-desktop:i386 (1.361)
 Purge: unity:i386 (7.4.0+16.04.20160715-0ubuntu1)
DpkgTerminalLog:
 Removing ubuntu-desktop (1.361) ...
 dpkg: error processing package unity (--purge):
  package is in a very bad inconsistent state; you should
  reinstall it before attempting a removal
DuplicateSignature:
 package:unity:7.4.0+16.04.20160715-0ubuntu1
 Removing ubuntu-desktop (1.361) ...
 dpkg: error processing package unity (--purge):
  package is in a very bad inconsistent state; you should
ErrorMessage: package is in a very bad inconsistent state; you should reinstall it before attempting a removal
GraphicsCard:
 Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [1462:2111]
GsettingsChanges:

InstallationDate: Installed on 2013-07-27 (1397 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
MachineType: MSI MS-7758
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic root=UUID=ec906892-8bdf-4881-89cb-3659308f0daf ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: unity
Title: package unity 7.4.0+16.04.20160715-0ubuntu1 failed to install/upgrade: package is in a very bad inconsistent state; you should reinstall it before attempting a removal
UpgradeStatus: Upgraded to xenial on 2016-08-07 (290 days ago)
dmi.bios.date: 03/16/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.8
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: ZH77A-G43 Plus (MS-7758)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.8:bd03/16/2013:svnMSI:pnMS-7758:pvr1.0:rvnMSI:rnZH77A-G43Plus(MS-7758):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.name: MS-7758
dmi.product.version: 1.0
dmi.sys.vendor: MSI
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Wed May 24 22:36:48 2017
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Video Bus KEYBOARD, id 7
 input Power Button KEYBOARD, id 8
 input Logitech USB Optical Mouse MOUSE, id 9
 input AT Translated Set 2 keyboard KEYBOARD, id 10
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.18.4-0ubuntu0.2