Shift-Alt-Tab stopped working in 18.04

[Carl-Erik Kopseng]

I already asked question #665667 in March about this, and it was concluded this was a bug I should report. That pressing Shift while pressing Alt-Tab does not reverse the direction is still an issue. Using Shift as a modifier used to work in previous Ubuntu versions, and also still works when using Super+Tab.

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Bionic Beaver (development branch)
Release: 18.04
Codename: bionic

$ apt-cache policy gnome-shell
gnome-shell:
  Installert: 3.28.0-0ubuntu5
  Kandidat: 3.28.0-0ubuntu5
  Versjonstabell:
 *** 3.28.0-0ubuntu5 500
        500 http://no.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

Expected:
Pressing Shift when repeatedly pressing Alt-Tab should reverse the order in which windows are being presented.

Actual:
The order is not being reversed. Shift has no effect.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.0-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 17 00:10:22 2018
DisplayManager: gdm3
EcryptfsInUse: Yes
GsettingsChanges:
 b'org.gnome.shell' b'enabled-extensions' b"['Usermenu_Message_Notifier@pgolm', '<email address hidden>']"
 b'org.gnome.shell' b'command-history' redacted by apport
 b'org.gnome.shell' b'favorite-apps' redacted by apport
 b'org.gnome.shell.keybindings' b'focus-active-notification' b'@as []'
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2017-12-15 (122 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to bionic on 2018-03-14 (32 days ago)

[Daniel van Vugt (vanvugt)]

Does bug 1762952 explain what you see?

[Carl-Erik Kopseng (carlerik)]

@Daniel, yes, this is a duplicate of this, although I never noticed the input language changed as well! Can be closed as a duplicate.

[Sergey Naumov (sknaumov)]

I had the same problem on Xubuntu-18.04 with midnight commander: Alt + Shift + / worked as alt + / and changed keyboard layout. On Xubuntu-16.04 everything worked fine out of the box. On 18.04 I changed keyboard layout setting from system default to custom and used Left Shift + Left Alt for layout change to fix the problem.