UPDATES that could have caused the work-space switcher to malfunction:

Start-Date: 2018-02-01  00:51:22
Commandline: (hidden)
Upgrade: libwebkit2gtk-4.0-37:i386 (2.18.5-0ubuntu0.16.04.1, 
2.18.6-0ubuntu0.16.04.1), gir1.2-webkit2-4.0:i386 (2.18.5-0ubuntu0.16.04.1, 
2.18.6-0ubuntu0.16.04.1), libjavascriptcoregtk-4.0-18:i386 
(2.18.5-0ubuntu0.16.04.1, 2.18.6-0ubuntu0.16.04.1), 
libwebkit2gtk-4.0-37-gtk2:i386 (2.18.5-0ubuntu0.16.04.1, 
2.18.6-0ubuntu0.16.04.1), gir1.2-javascriptcoregtk-4.0:i386 
(2.18.5-0ubuntu0.16.04.1, 2.18.6-0ubuntu0.16.04.1)
End-Date: 2018-02-01  00:51:27

Start-Date: 2018-01-29  21:21:35
Commandline: (hidden)
Upgrade: libmpx0:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), 
libgcc-5-dev:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), cpp-5:i386 
(5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), libitm1:i386 
(5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), libcilkrts5:i386 
(5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), libasan2:i386 
(5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), libquadmath0:i386 
(5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), 
thunderbird-gnome-support:i386 (1:52.5.0+build1-0ubuntu0.16.04.1, 
1:52.6.0+build1-0ubuntu0.16.04.1), gcc-5-base:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), libstdc++-5-dev:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), libubsan0:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), g++-5:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), thunderbird-locale-en-gb:i386 
(1:52.5.0+build1-0ubuntu0.16.04.1, 1:52.6.0+build1-0ubuntu0.16.04.1), 
libgfortran3:i386 (5.4.0-6ubuntu1~16.04.5, 5.4.0-6ubuntu1~16.04.6), 
thunderbird-locale-en-us:i386 (1:52.5.0+build1-0ubuntu0.16.04.1, 
1:52.6.0+build1-0ubuntu0.16.04.1), gcc-5:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), libgomp1:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), thunderbird:i386 (1:52.5.0+build1-0ubuntu0.16.04.1, 
1:52.6.0+build1-0ubuntu0.16.04.1), libatomic1:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), libcc1-0:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), libstdc++6:i386 (5.4.0-6ubuntu1~16.04.5, 
5.4.0-6ubuntu1~16.04.6), thunderbird-locale-en:i386 
(1:52.5.0+build1-0ubuntu0.16.04.1, 1:52.6.0+build1-0ubuntu0.16.04.1)
End-Date: 2018-01-29  21:21:53

Start-Date: 2018-01-27  09:48:36
Commandline: (hidden)
Upgrade: libfwup0:i386 (0.5-2ubuntu5, 0.5-2ubuntu7), libtasn1-doc:i386 
(4.7-3ubuntu0.16.04.2, 4.7-3ubuntu0.16.04.3), update-notifier-common:i386 
(3.168.5, 3.168.7), fwupdate:i386 (0.5-2ubuntu5, 0.5-2ubuntu7), 
chromium-browser:i386 (63.0.3239.84-0ubuntu0.16.04.1, 
63.0.3239.132-0ubuntu0.16.04.1), firefox-locale-en:i386 
(57.0.4+build1-0ubuntu0.16.04.1, 58.0+build6-0ubuntu0.16.04.1), 
chromium-codecs-ffmpeg-extra:i386 (63.0.3239.84-0ubuntu0.16.04.1, 
63.0.3239.132-0ubuntu0.16.04.1), libtasn1-6-dev:i386 (4.7-3ubuntu0.16.04.2, 
4.7-3ubuntu0.16.04.3), libgcab-1.0-0:i386 (0.7-1, 0.7-1ubuntu0.1), firefox:i386 
(57.0.4+build1-0ubuntu0.16.04.1, 58.0+build6-0ubuntu0.16.04.1), rsync:i386 
(3.1.1-3ubuntu1.1, 3.1.1-3ubuntu1.2), linux-firmware:i386 (1.157.14, 1.157.15), 
libtasn1-6:i386 (4.7-3ubuntu0.16.04.2, 4.7-3ubuntu0.16.04.3), 
chromium-browser-l10n:i386 (63.0.3239.84-0ubuntu0.16.04.1, 
63.0.3239.132-0ubuntu0.16.04.1), fwupdate-signed:i386 (1.11.1+0.5-2ubuntu5, 
1.11.3+0.5-2ubuntu7), update-notifier:i386 (3.168.5, 3.168.7)
End-Date: 2018-01-27  09:50:12

I believe it shouldn't have been an earlier update than 27th January.

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https://bugs.launchpad.net/bugs/1746741

Title:
  cannot switch between workspaces with ctrl alt arrow after one update

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Hello!

  After the update manager popped up and I've done the update, it seems
  that the ctrl alt arrows are no longer working to switch between the
  workspaces?

  I can still switch by using the mouse andthe icon on the launcher, it
  just takes more time and Idislike that.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic i686
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.15
  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
  CurrentDesktop: Unity
  Date: Thu Feb  1 14:18:35 2018
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  DpkgLog:
   
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] 
(rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:220c]
  InstallationDate: Installed on 2015-08-06 (910 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release i386 
(20150218.1)
  MachineType: LENOVO 20B7S0JC01
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-112-generic 
root=UUID=9658f381-e022-4f56-b2bb-b493ccdc4c3b ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/10/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET71WW (2.21 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20B7S0JC01
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 PRO
  dmi.chassis.asset.tag: AH509827
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrGJET71WW(2.21):bd02/10/2014:svnLENOVO:pn20B7S0JC01:pvrThinkPadT440:rvnLENOVO:rn20B7S0JC01:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20B7S0JC01
  dmi.product.version: ThinkPad T440
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.libdrm2: libdrm2 2.4.83-1~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu1~16.04.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu1~16.04.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7
  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+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Thu Feb  1 14:11:17 2018
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12350 
   vendor                                     AUO
  xserver.version: 2:1.18.4-0ubuntu0.7

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