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

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