Public bug reported:

I've recently switched from 16.04/Unity to 18.04/Gnome3, with new
hardware (a Lenovo Thinkpad T470s) used mostly with a docking station
and external keyboard.

I do heavily use of in-workspace windows switch (eg, Alt+Esc) and i've found 
that every time i press Alt+Backslash (in Italian keyboard layout Backslash is 
all left, between TAB and Esc keys) my session ''lock up'': i can switch 
between windows, i can use the gnome shell and the top bar (status bar?), i can 
even run other application (via Alt+F2 or gnome shell menu) but every window 
(old or new) are ''locked'', like there's no focus: no keyboard nor mouse 
interaction is possible.
Application are not 'locked', they continue to run, but there's no way to 
interact with them.

I can also lock the screen, or put the system in standby: i can awaken
from that, insert the password but still no focus on windows.

The only solution: logout.

I've also tried to define a keyboard shortcut to map Alt+Backslash,
but... gnome keyboard configurator locks as every other window when i
press the keys.

Please, help me at least to disable that 'killer' keyboard shortcut! ;-)


ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul  3 12:16:18 2018
DisplayManager: gdm3
 b'' b'enabled-extensions' 
'', '']"
 b'' b'command-history' redacted by apport
 b'' b'favorite-apps' redacted by apport
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2018-05-25 (38 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
 PATH=(custom, no user)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  Pressing Alt+Backslash locks up all windows (no focus)

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