Yes it appears the crash is:
Dec 25 15:18:52 x1c5 gnome-session[3657]: gnome-session-binary[3657]: WARNING:
App 'org.gnome.Shell.desktop' exited with code 1
Dec 25 15:18:52 x1c5 gnome-session-binary[3657]: WARNING: App
'org.gnome.Shell.desktop' exited with cod
which looks likely to be caused by:
Dec 25 15:18:52 x1c5 gnome-shell[3813]: JS ERROR: Error: No valid stylesheet
found for 'Yaru/gnome-shell.css'
loadTheme@resource:///org/gnome/shell/ui/main.js:358:15
_loadDefaultStylesheet@resource:///org/gnome/shell/ui/main.js:306:5
_initializeUI@resource:///org/gnome/shell/ui/main.js:160:5
start@resource:///org/gnome/shell/ui/main.js:136:5
@<main>:1:31
Dec 25 15:18:52 x1c5 gnome-shell[3813]: Execution of main.js threw exception:
Script <main> threw an exception
So yes it does sound like a theming problem. My only suggestion right
now is to find a way to reset/reinstall any theme-related changes you
have made. That might fix it but it won't tell us exactly what kind of
change caused the problem :(
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
** Summary changed:
- gnome-shell 3.30.1-2ubuntu1.18.10.1 prevents DE access (unable to login)
+ gnome-shell 3.30.1-2ubuntu1.18.10.1 fails to start with JS ERROR: Error: No
valid stylesheet found for 'Yaru/gnome-shell.css'
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https://bugs.launchpad.net/bugs/1809092
Title:
gnome-shell 3.30.1-2ubuntu1.18.10.1 fails to start with JS ERROR:
Error: No valid stylesheet found for 'Yaru/gnome-shell.css'
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
An upgrade to gnome-shell on 18.10 was recently released which made it
impossible for me to log in to my DE. Upon typing my password, the
gdm screen would disappear, only to re-appear a few seconds later.
This was not a password typo as I didn't get the usual msg to that
effect (I made at least 5 attempts, carefully typing my passwd).
I solved the issue by switching to a terminal screen (using
CTRL+ALT+F6 I believe), logging in, analyzing recent changes through
/var/log/apt/history.log. Beside the gnome-shell packages, a handful
of Wayland packages were also upgraded as follows (I use X.org so left
those alone):
Start-Date: 2018-12-19 09:13:20
Commandline: aptdaemon role='role-commit-packages' sender=':1.8821'
Upgrade: libwayland-egl1:amd64 (1.16.0-1ubuntu1, 1.16.0-1ubuntu1.1),
keybase:amd64 (2.11.0-20181204152506.f11f4191e3,
2.13.0-20181218221625.d72e065cbe), gnome-tweak-tool:amd64 (3.30.1-1,
3.30.2-0ubuntu1), gnome-tweaks:amd64 (3.30.1-1, 3.30.2-0ubuntu1),
libwayland-client0:amd64 (1.16.0-1ubuntu1, 1.16.0-1ubuntu1.1),
gnome-shell-common:amd64 (3.30.1-2ubuntu1, 3.30.1-2ubuntu1.18.10.1),
gnome-shell:amd64 (3.30.1-2ubuntu1, 3.30.1-2ubuntu1.18.10.1),
libwayland-server0:amd64 (1.16.0-1ubuntu1, 1.16.0-1ubuntu1.1),
libwayland-cursor0:amd64 (1.16.0-1ubuntu1, 1.16.0-1ubuntu1.1)
End-Date: 2018-12-19 09:13:31
I solved the issue by downgrading the just-updated gnome-shell
packages as follows:
sudo apt install gnome-shell-common=3.30.1-2ubuntu1 gnome-
shell=3.30.1-2ubuntu1
Having done this, I switched back to the GDM screen and managed to log
in as normal. I couldn't find any smoking gun in system logs but
please let me know if there's a way to collect any useful debug info.
One thing I'm using which differs from stock 18.10 is the System76
"Pop" theme (let me know if you need details). Presumably a theme
cannot cause such issues and/or if the new version of gnome-shell is
meant to be incompatible with themes other than Yaru, this should be
clearly documented.
The problematic versions are the "Candidate" shown below:
gnome-shell:
Installed: 3.30.1-2ubuntu1
Candidate: 3.30.1-2ubuntu1.18.10.1
Version table:
3.30.1-2ubuntu1.18.10.1 500
500 http://ch.archive.ubuntu.com/ubuntu cosmic-updates/main amd64
Packages
*** 3.30.1-2ubuntu1 500
500 http://ch.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
100 /var/lib/dpkg/status
gnome-shell-common:
Installed: 3.30.1-2ubuntu1
Candidate: 3.30.1-2ubuntu1.18.10.1
Version table:
3.30.1-2ubuntu1.18.10.1 500
500 http://ch.archive.ubuntu.com/ubuntu cosmic-updates/main amd64
Packages
500 http://ch.archive.ubuntu.com/ubuntu cosmic-updates/main i386
Packages
*** 3.30.1-2ubuntu1 500
500 http://ch.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
500 http://ch.archive.ubuntu.com/ubuntu cosmic/main i386 Packages
100 /var/lib/dpkg/status
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