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'

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