Thanks. prevjournal.txt does seem to show gnome-shell repeatedly failing
with:

Jan 07 16:03:33 luis-XPS-15-9560 gnome-shell[2211]: JS ERROR: Error: Requiring 
NMA, version none: Typelib file for namespace 'NMA' (any version) not found
                                                    
@resource:///org/gnome/shell/misc/modemManager.js:4:35
                                                    
@resource:///org/gnome/shell/ui/status/network.js:12:22
                                                    
_init@resource:///org/gnome/shell/ui/panel.js:726:13
                                                    
_ensureIndicator@resource:///org/gnome/shell/ui/panel.js:1069:25
                                                    
_updateBox@resource:///org/gnome/shell/ui/panel.js:1080:34
                                                    
_updatePanel@resource:///org/gnome/shell/ui/panel.js:1026:14
                                                    
_init@resource:///org/gnome/shell/ui/panel.js:835:14
                                                    
_initializeUI@resource:///org/gnome/shell/ui/main.js:206:13
                                                    
start@resource:///org/gnome/shell/ui/main.js:146:5
                                                    @<main>:1:47
Jan 07 16:03:33 luis-XPS-15-9560 gnome-shell[2211]: Execution of main.js threw 
exception: Script <main> threw an exception
Jan 07 16:03:33 luis-XPS-15-9560 gnome-shell[2211]: Attempting to call back 
into JSAPI during the sweeping phase of GC. This is most likely caused by not 
destroying a Clutter actor or Gtk+ widget with ::destroy signals connected, but 
can also be caused by using the destroy(), dispose(), or remove() vfuncs. 
Because it would crash the application, it has been blocked and the JS callback 
not invoked.
Jan 07 16:03:33 luis-XPS-15-9560 org.gnome.Shell.desktop[2211]: == Stack trace 
for context 0x5617ef98b780 ==
Jan 07 16:03:33 luis-XPS-15-9560 gnome-shell[2211]: The offending signal was 
destroy on Gjs_ui_panel_AggregateMenu 0x5617efc96c60.

-----------------------

Jan 07 16:03:37 luis-XPS-15-9560 gnome-shell[2645]: JS ERROR: Error: Requiring 
NMA, version none: Typelib file for namespace 'NMA' (any version) not found
                                                    
@resource:///org/gnome/shell/misc/modemManager.js:4:35
                                                    
@resource:///org/gnome/shell/ui/status/network.js:12:22
                                                    
_init@resource:///org/gnome/shell/ui/panel.js:726:13
                                                    
_ensureIndicator@resource:///org/gnome/shell/ui/panel.js:1069:25
                                                    
_updateBox@resource:///org/gnome/shell/ui/panel.js:1080:34
                                                    
_updatePanel@resource:///org/gnome/shell/ui/panel.js:1026:14
                                                    
_init@resource:///org/gnome/shell/ui/panel.js:835:14
                                                    
_initializeUI@resource:///org/gnome/shell/ui/main.js:206:13
                                                    
start@resource:///org/gnome/shell/ui/main.js:146:5
                                                    @<main>:1:47
Jan 07 16:03:37 luis-XPS-15-9560 gnome-shell[2645]: Execution of main.js threw 
exception: Script <main> threw an exception
Jan 07 16:03:37 luis-XPS-15-9560 gnome-shell[2645]: Attempting to call back 
into JSAPI during the sweeping phase of GC. This is most likely caused by not 
destroying a Clutter actor or Gtk+ widget with ::destroy signals connected, but 
can also be caused by using the destroy(), dispose(), or remove() vfuncs. 
Because it would crash the application, it has been blocked and the JS callback 
not invoked.
Jan 07 16:03:37 luis-XPS-15-9560 gnome-shell[2645]: The offending signal was 
destroy on Gjs_ui_panel_AggregateMenu 0x5637c66ffae0.
Jan 07 16:03:37 luis-XPS-15-9560 org.gnome.Shell.desktop[2645]: == Stack trace 
for context 0x5637c4526b50 ==

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https://bugs.launchpad.net/bugs/1910559

Title:
  GDM3: Black screen with blinking cursor

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