No matter how I try to lock my screen (Super + L, Menu Item, or Time Out) the screen tries to lock, but freezes for a second, and resumes my running gnome session as it was. If I try again after that, my session freezes and has to be restarted.
If my computer is left at the regular login screen with no user signed in, It will respect power settings, and turn the screen off after 10 minutes.
The following is a dump of my Syslog at the time of crash.
------------------------------------------------------------------------------
gnome-shell[10234]: Extension "<email address hidden>" had error: TypeError: dockManager is null
gnome-software[10414]: no app for changed <email address hidden>
gnome-software[10414]: no app for changed <email address hidden>
gnome-shell[10234]: The actor 'ShellGenericContainer' is currently being destroyed, and cannot be added as a child of another actor.
gnome-software[10414]: no app for changed <email address hidden>
gnome-software[10414]: no app for changed <email address hidden>
gnome-software[10414]: no app for changed <email address hidden>
gnome-shell[10234]: ../../../../gobject/gsignal.c:2641: instance '0x55b266c13730' has no handler with id '10398'
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
gnome-shell[10234]: g_object_set: assertion 'G_IS_OBJECT (object)' failed
gnome-shell[10234]: message repeated 2 times: [ g_object_set: assertion 'G_IS_OBJECT (object)' failed]
gnome-software[10414]: no app for changed <email address hidden>
gnome-software[10414]: no app for changed <email address hidden>
gnome-software[10414]: no app for changed <email address hidden>
gnome-shell[10234]: WARNING: addSignalMethods is replacing existing [0x55b2699452b0 Gjs_ShowAppsIcon.dash-item-container] connect method
gnome-shell[10234]: WARNING: addSignalMethods is replacing existing [0x55b2699452b0 Gjs_ShowAppsIcon.dash-item-container] disconnect method
gnome-shell[10234]: WARNING: addSignalMethods is replacing existing [0x55b2699452b0 Gjs_ShowAppsIcon.dash-item-container] emit method
gnome-shell[10234]: Settings schema 'org.gnome.shell.extensions.dash-to-dock' does not contain a key named 'customize-alphas'
kernel: [38115.855449] traps: gnome-shell[10234] trap int3 ip:7fc0a6738961 sp:7ffe8d7e77b0 error:0 in libglib-2.0.so.0.5400.1[7fc0a66e8000+111000]
gnome-session[10148]: gnome-session-binary[10148]: WARNING: Application 'org.gnome.Shell.desktop' killed by signal 5
gnome-session-binary[10148]: WARNING: Application 'org.gnome.Shell.desktop' killed by signal 5
gsd-media-keys[10337]: Couldn't lock screen: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-0: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-0: Internal TMDS
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): Ancor Communications Inc MX279 (DFP-1): connected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): Ancor Communications Inc MX279 (DFP-1): Internal TMDS
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): Ancor Communications Inc MX279 (DFP-1): 600.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-2: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-2: Internal DisplayPort
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-2: 1440.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-3: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-4: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-4: 1440.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-5: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-5: Internal TMDS
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-5: 165.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-6: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-6: Internal DisplayPort
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-6: 1440.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-7: disconnected
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-7: Internal TMDS
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0): DFP-7: 165.0 MHz maximum pixel clock
/usr/lib/gdm3/gdm-x-session[10136]: (--) NVIDIA(GPU-0):
gnome-shell[12138]: JS WARNING: [resource:///org/gnome/shell/ui/main.js 315]: reference to undefined property "MetaStage"
gnome-shell[12138]: JS WARNING: [resource:///org/gnome/shell/ui/layout.js 221]: reference to undefined property "MetaWindowGroup"
gnome-shell[12138]: JS WARNING: [resource:///org/gnome/shell/ui/osdMonitorLabeler.js 59]: reference to undefined property "MetaDBusDisplayConfigSkeleton"
gnome-shell[12138]: JS WARNING: [resource:///org/gnome/gjs/modules/tweener/tweener.js 540]: reference to undefined property "isSpecialProperty"
org.gnome.Shell.desktop[12138]: current session already has an ibus-daemon.
gnome-shell[12138]: JS WARNING: [resource:///org/gnome/shell/ui/slider.js 38]: reference to undefined property "CallyActor"
dbus[1127]: [system] Activating via systemd: service name='org.freedesktop.GeoClue2' unit='geoclue.service'
systemd[1]: Starting Location Lookup Service...
dbus[1127]: [system] Successfully activated service 'org.freedesktop.GeoClue2'
systemd[1]: Started Location Lookup Service.
gnome-shell[12138]: Telepathy is not available, chat integration will be disabled.
gnome-shell[12138]: JS WARNING: [/<email address hidden>/utils.js 34]: reference to undefined property Symbol.toPrimitive
gnome-shell[12138]: JS WARNING: [/home/USERNAME<email address hidden>/extension.js 45]: reference to undefined property "text"
gnome-shell[12138]: loading user theme: /usr/share/themes/Arc-Dark/gnome-shell/gnome-shell.css
gnome-shell[12138]: Some code accessed the property 'SignalManager' on the module 'convenience'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'SoundDeviceChooserBase' on the module 'base'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'SETTINGS_SCHEMA' on the module 'prefs'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: JS WARNING: [/home/USERNAME<email address hidden>/convenience.js 193]: reference to undefined property Symbol.toPrimitive
gnome-shell[12138]: Some code accessed the property 'SHOW_INPUT_SLIDER' on the module 'prefs'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'DBusMenu' on the module 'interfaces'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'WORKAROUND_RELOAD_TYPE_REGISTER' on the module 'util'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'StatusNotifierWatcher' on the module 'statusNotifierWatcher'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'StatusNotifierWatcher' on the module 'interfaces'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Some code accessed the property 'traverseBusNames' on the module 'util'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: JS WARNING: [/<email address hidden>/appIcons.js 1361]: unreachable code after return statement
gnome-shell[12138]: JS WARNING: [/<email address hidden>/extension.js 44]: assignment to undeclared variable runningExtensions
gnome-shell[12138]: length values must specify a unit
gnome-shell[12138]: message repeated 3 times: [ length values must specify a unit]
gnome-shell[12138]: Some code accessed the property 'Logger' on the module 'util'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: [AppIndicatorSupport-WARN] Failed to acquire org.kde.StatusNotifierWatcher
gnome-shell[12138]: Some code accessed the property 'introspectBusObject' on the module 'util'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
bluetoothd[1110]: Failed to set mode: Blocked through rfkill (0x12)
gnome-shell[12138]: Some code accessed the property 'dbusNodeImplementsInterfaces' on the module 'util'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
gnome-shell[12138]: Error looking up permission: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.impl.portal.PermissionStore was not provided by any .service files
org.gnome.Shell.desktop[12138]: Window manager warning: "XF86RFKill" is not a valid accelerator
gnome-shell[12138]: [AppIndicatorSupport-DEBUG] Using Brute-force mode for StatusNotifierItem :1.255/org/ayatana/NotificationItem/software_update_available
gnome-shell[12138]: [AppIndicatorSupport-DEBUG] Registering StatusNotifierItem :1.255/org/ayatana/NotificationItem/software_update_available
gnome-shell[12138]: Some code accessed the property 'AppIndicator' on the module 'appIndicator'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.
------------------------------------------------------------------------------
Of particular interest is the line: gsd-media-keys[10337]: Couldn't lock screen: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying but I can't make heads or tails of it.
Installed and active Extensions: Arc Menu, Dash to Dock, Removable Drive Menu, Remove Dropdown Arrows, Topicons Plus, UserThemes.
Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1769383, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.