Thank you for helping to triage and sorry for the late response.  I no
longer have as much time for Launchpad as I used to.

Here are the last few lines from journalctl.  I hope they mean something
to you.

Mar 23 03:26:35 work sudo[22956]: pam_unix(sudo:session): session closed for 
user root
Mar 23 03:27:00 work unity-scope-loa[10494]: daemon.vala:679: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
org.gnome.zeitgeist.Engine was not provided by any .service files
Mar 23 03:27:05 work compiz[2115]: ERROR 2019-03-23 03:27:05 unityfree 
<unknown>:0 g_sequence_get: assertion '!is_end (iter)' failed
Mar 23 03:27:05 work compiz[2115]: ERROR 2019-03-23 03:27:05 unity null 
<unknown>:0 Unable to get value. NULL row data in 
DeeSequenceModel@0x562b2e019ea0 at position 1. The row has probably been removed
Mar 23 03:27:05 work compiz[2115]: ERROR 2019-03-23 03:27:05 unity null 
<unknown>:0 Unable to get string. Column 5 in DeeSequenceModel@0x562b2e019ea0 
holds a NULL value in row 1
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_type: assertion 
'value != NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_type_is_subtype_of: 
assertion 'g_variant_type_check (type)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_boolean: assertion 
'g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_unref: assertion 'value 
!= NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_type: assertion 
'value != NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_type_is_subtype_of: 
assertion 'g_variant_type_check (type)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_boolean: assertion 
'g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_unref: assertion 'value 
!= NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_type: assertion 
'value != NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_type_is_subtype_of: 
assertion 'g_variant_type_check (type)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_boolean: assertion 
'g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_unref: assertion 'value 
!= NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_type: assertion 
'value != NULL' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_type_is_subtype_of: 
assertion 'g_variant_type_check (type)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_get_boolean: assertion 
'g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN)' failed
Mar 23 03:27:11 work gnome-control-c[22988]: g_variant_unref: assertion 'value 
!= NULL' failed
Mar 23 03:27:12 work kernel: Bluetooth: hci0: last event is not cmd complete 
(0x0f)

And here is the CLI output you requested.

$ G_DEBUG_MESSAGES=all gnome-control-center bluetooth

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.558:
g_variant_get_type: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.558:
g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)'
failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.558:
g_variant_get_boolean: assertion 'g_variant_is_of_type (value,
G_VARIANT_TYPE_BOOLEAN)' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.558:
g_variant_unref: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.558:
g_variant_get_type: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.558:
g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)'
failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_get_boolean: assertion 'g_variant_is_of_type (value,
G_VARIANT_TYPE_BOOLEAN)' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_unref: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_get_type: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)'
failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_get_boolean: assertion 'g_variant_is_of_type (value,
G_VARIANT_TYPE_BOOLEAN)' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_unref: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_get_type: assertion 'value != NULL' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)'
failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_get_boolean: assertion 'g_variant_is_of_type (value,
G_VARIANT_TYPE_BOOLEAN)' failed

(gnome-control-center:23143): GLib-CRITICAL **: 03:31:11.559:
g_variant_unref: assertion 'value != NULL' failed


** Changed in: gnome-control-center (Ubuntu)
       Status: Expired => New

-- 
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1776000

Title:
  gnome-control-center says "no bluetooth found" even though bluetooth
  is present and somewhat usable

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