Public bug reported:
Steps to reproduce:
1. In Gnome-Shell, click the clock readout to show the detail dialog, then
select "Date & Time Settings".
2. Select the radio button for "AM/PM" and close the window. Notice that the
clock readout format remains unchanged.
3. Press alt+f2 and enter r to reload Gnome-Shell. Notice Gnome-Shell never
reloads and becomes frozen.
4. In a terminal shell, type `sudo reboot` to reboot the computer.
5. Try to login. Lightdm appears to accept your password, but after several
minutes of showing a blank background, redirects you back to the login screen.
6. Try to login as guest. Notice Gnome-Shell still loads correctly with a blank
profile.
Expected result: Changing clock format should update the clock format,
and not render my computer unusable.
Actual result: Changing clock format corrupts something in
~/.config/dconf/user, which prevents Gnome-Shell from loading.
Workaround: As mentioned in various tickets and blogs as a solution
behind the infamous "Ubuntu login screen redirects back to the login
screen" bug, the only option that worked for me was to delete
~/.config/dconf/user and then restart lightdm. This temporarily fixes
it, however it also deletes all your Gnome-Shell preferences and
customizations. Also, if you try to change the clock format, you'll
again hose all your Gnome preferences.
I suspect this bug was introduced within the last couple months, because
the machine this occurred on is fairly new and I first set the clock
format just a few months ago. I've also changed clock format on several
different 14.04 machines without issue. This problem occurred today
after I ran a normal `apt-get upgrade` and then rebooted. It left me
locked out at the login screen, and I tried many different solutions.
Eventually I stumbled onto the `rm ~/.config/dconf/user` fix, but it
wasn't until I tried re-applying all my customizations before I realized
that the clock format change is the specific one that triggers the bug.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-shell 3.10.4-0ubuntu5.2
ProcVersionSignature: Ubuntu 3.19.0-39.44~14.04.1-generic 3.19.8-ckt9
Uname: Linux 3.19.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Dec 14 20:04:58 2015
DisplayManager: lightdm
GsettingsChanges: b'org.gnome.desktop.interface' b'gtk-im-module'
b"'gtk-im-context-simple'"
InstallationDate: Installed on 2015-10-20 (55 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1526119
Title:
Setting clock to AM/PM causes Gnome-Shell to crash and prevents the
user from logging in
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https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1526119/+subscriptions
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