My gut feeling is that the following is the cause:

févr. 17 11:09:07 dresden gnome-shell[4485]: Failed to interact with fprintd 
service: Error: GSettings key enable-authd-authentication not found in schema 
com.ubuntu.login-screen
  Stack trace:
    _checkKey@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:779:23
    
createCheckedMethod/<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:729:30
    _getDetectedDefaultService@resource:///org/gnome/shell/gdm/util.js:905:34
    _initFingerprintManager@resource:///org/gnome/shell/gdm/util.js:526:23
    _updateEnabledServices@resource:///org/gnome/shell/gdm/util.js:858:18
    ShellUserVerifier@resource:///org/gnome/shell/gdm/util.js:183:14
    _createUserVerifier@resource:///org/gnome/shell/gdm/authPrompt.js:147:16
    _init@resource:///org/gnome/shell/gdm/authPrompt.js:89:35
    AuthPrompt@resource:///org/gnome/shell/gdm/authPrompt.js:66:4
    _init@resource:///org/gnome/shell/gdm/loginDialog.js:535:28
    LoginDialog@resource:///org/gnome/shell/gdm/loginDialog.js:487:4
    _ensureUnlockDialog@resource:///org/gnome/shell/ui/screenShield.js:470:28
    showDialog@resource:///org/gnome/shell/ui/screenShield.js:402:14
    _initializeUI/<@resource:///org/gnome/shell/ui/main.js:316:26
    _prepareStartupAnimation@resource:///org/gnome/shell/ui/layout.js:762:18
    
_loadBackground/signalId</id<@resource:///org/gnome/shell/ui/layout.js:691:26
    @resource:///org/gnome/shell/ui/init.js:21:20

I can't find trace of this error in earlier logs of the system, and it *does* 
talk of auth prompts...
However, I was unable to find any mention of "enable-authd-authentication" in 
the sources of either gdm3, gcr or fprintd.

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https://bugs.launchpad.net/bugs/2098654

Title:
  /usr/libexec/gcr-
  
prompter:11:gtk_im_multicontext_set_slave:im_module_setting_changed:g_closure_invoke:signal_emit_unlocked_R:signal_emit_valist_unlocked

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