Alt+Arrow in gnome-shell unexpectedly switches VTs

[Brian Murray]

I'm experiencing a bug similar to bug 1710637 with Ubuntu 17.10 again.

Test Case
---------
schroot -u root -c trusty-amd64
edit /etc/apt/sources.list to xenial
apt-get update
apt-get install console-setup
use alt+tab to bring up the window switcher
then use alt+arrow to switch windows

I then end up at the gdm login screen or a virtual tty.

Installing a different set of packages, via apt-get dist-upgrade, actually ended up killing my desktop session.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.1-0ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 23 14:30:16 2017
DisplayManager: gdm3
EcryptfsInUse: Yes
GsettingsChanges:
 b'org.gnome.shell' b'enabled-extensions' b"['<email address hidden>', 'multi-monitors-add-on@spin83', '<email address hidden>', '<email address hidden>']"
 b'org.gnome.shell' b'favorite-apps' b"['org.gnome.Nautilus.desktop', 'terminator.desktop', 'virt-manager.desktop', 'chromium-browser.desktop', 'firefox.desktop', 'simple-scan.desktop']"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'clock-show-date' b'true'
InstallationDate: Installed on 2013-01-16 (1741 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130116)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Brian Murray (brian-murray)]

I tried using Laney's kbd.c program from the other bug and it does show K_UNICODE. Additionally, passing it FIX did fix the situation.

[Iain Lane (laney)]

Thanks for the report, but it's a console-setup and not a gnome-shell bug. It's changing the keyboard mode under our feet.

I'm excited that you can trigger this from a chroot. The reproducer seems kind of niche, but I guess it's up to you & cyphermox whether you'd like to backport the fixes to stables (and whether they need altering along the way).

[Iain Lane (laney)]

I think those series are right, although you might not be bothered about / need to care for Trusty.

[Daniel van Vugt (vanvugt)]

I'm confused. This bug was reported against 17.10 and you're saying it's already fixed? That implies Brian hadn't updated since the fix on 19 September... ?!

[Iain Lane (laney)]

No. In the test case given, he uses packages in a chroot from an older release which don't have the fixes that were applied in artful.

[Adam Conrad (adconrad)]

The real question here is why a rule in a chroot is being executed by a udev outside the chroot. WTF, udev.

[Adam Conrad (adconrad)]

Oh, derp. It's not the udev rule, it's the console-setup postinst.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Stephen Early (steve-greenend)]

Yes - this happened to me after running debootstrap of 16.04 in a chroot.

[Alessandro Cuttin (a-f-cuttin)]

I can confirm, too, that 16.04 is affected.