Public bug reported:
CONTEXT
I was running 17.04, and had manually installed gdm3, gnome-shell etc.
to use the GNOME Shell. I had also installed some extensions (from both
the respositories and through extensions.gnome.org).
I used "sudo do-release-upgrade" to upgrade from 17.04 to 17.10.
$ lsb_release -rd && apt-cache policy gnome-shell
Description: Ubuntu 17.10
Release: 17.10
gnome-shell:
Installed: 3.26.1-0ubuntu4
Candidate: 3.26.1-0ubuntu4
Version table:
*** 3.26.1-0ubuntu4 500
500 http://us.archive.ubuntu.com/ubuntu artful/main amd64 Packages
100 /var/lib/dpkg/status
After rebooting, I tried to install in with all of the available sessions,
including:
- GNOME
- GNOME Classic
- GNOME on Xorg
- Ubuntu
- Ubuntu on Xorg
Expected: I'm able to log in to the desktop.
Observed: In every case, I would be kicked back to the GDM greeter.
WORKAROUND
Checking the output of `journalctl`, I noticed the following lines:
Oct 19 15:51:17 khaeru-laptop gnome-shell[30363]: loading default theme
(Adwaita)
Oct 19 15:51:17 khaeru-laptop gnome-shell[30363]: Settings schema
'org.gnome.shell.extensions.dash-to-dock' does not contain a key named
'opaque-background'
Oct 19 15:51:17 khaeru-laptop kernel: traps: gnome-shell[30363] trap int3
ip:7f194308c961 sp:7fff78248270 error:0 in
libglib-2.0.so.0.5400.1[7f194303c000+111000]
[…more…]
Oct 19 15:51:17 khaeru-laptop polkitd(authority=local)[1189]: Unregistered
Authentication Agent for unix-session:20 (system bus name :1.473, object path
/org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_CA.UTF-8)
(disconnected from bus)
Oct 19 15:51:17 khaeru-laptop gnome-session[30205]:
gnome-session-binary[30205]: WARNING: Application 'org.gnome.Shell.desktop'
killed by signal 5
Oct 19 15:51:17 khaeru-laptop gnome-session-binary[30205]: WARNING: Application
'org.gnome.Shell.desktop' killed by signal 5
In particular, the complaint about the settings schema always appeared
as the last message before the "kernel: traps: gnome-shell" message.
On a hunch, I disabled all extensions:
$ dconf reset /org/gnome/shell/enabled-extensions
After this, I was able to log in.
COMMENT
I understand that my manual installation/use of Gnome Shell prior to the
upgrade might have produced some unusual contents in that dconf key. The
prior value was:
enabled-extensions=['places-menu@gnome-shell-
extensions.gcampax.github.com', 'user-theme@gnome-shell-
extensions.gcampax.github.com', 'remove-dropdown-arr...@mpdeimos.com',
'workspace-indica...@gnome-shell-extensions.gcampax.github.com',
'suspend-button@laserb', 'pixel-s...@deadalnix.me', 'dash-to-
d...@micxgx.gmail.com']
The bug, IMO, is that this caused gnome-shell to crash that left me
unable to log in to any session. If particular extensions or dconf keys
are erroneous or broken, I would expect them to be disregarded and
perhaps some error message displayed while login continued.
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
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 19 16:02:39 2017
DisplayManager: gdm3
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-10-11 (8 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_CA.UTF-8
SHELL=/bin/bash
LC_PAPER=en_GB.UTF-8
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2017-10-19 (0 days ago)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug artful wayland-session
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https://bugs.launchpad.net/bugs/1724957
Title:
gnome-shell crashes → unable to log in after artful upgrade
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