Public bug reported:

After upgrading to Ubuntu 18.04, the network manager applet symbol isn't
displayed any longer. The other functionality (asking for credentials)
is working. I also see other symbols.


aptitude show network-manager-gnome
Paket: network-manager-gnome                    
Version: 1.8.10-2ubuntu1
Neu: ja
Zustand: Installiert


stdout/stderr:
Gtk-Message: 21:28:14.411: Failed to load module "appmenu-gtk-module"
Gtk-Message: 21:28:14.431: Failed to load module "topmenu-gtk-module"
Gtk-Message: 21:28:14.431: Failed to load module "appmenu-gtk-module"
Gtk-Message: 21:28:14.432: Failed to load module "topmenu-gtk-module"

** (nm-applet:29524): WARNING **: 21:28:14.668: Couldn't register with
accessibility bus: Did not receive a reply. Possible causes include: the
remote application did not send a reply, the message bus security policy
blocked the reply, the reply timeout expired, or the network connection
was broken.

(nm-applet:29524): nm-applet-WARNING **: 21:28:15.987: Cannot grab
information for modem at /org/freedesktop/ModemManager1/Modem/6: No
ModemManager support

(nm-applet:29524): nm-applet-WARNING **: 21:28:16.124: ModemManager is
not available for modem at /org/freedesktop/ModemManager1/Modem/6

(nm-applet:29524): Gtk-WARNING **: 21:28:16.127: Can't set a parent on
widget which has a parent

(nm-applet:29524): Gtk-CRITICAL **: 21:28:16.141: gtk_widget_destroy:
assertion 'GTK_IS_WIDGET (widget)' failed

(nm-applet:29524): Gtk-CRITICAL **: 21:28:16.141: gtk_widget_destroy:
assertion 'GTK_IS_WIDGET (widget)' failed

(nm-applet:29524): Gtk-WARNING **: 21:28:16.171: Can't set a parent on
widget which has a parent

(nm-applet:29524): Gtk-CRITICAL **: 21:28:21.500: gtk_widget_destroy:
assertion 'GTK_IS_WIDGET (widget)' failed

(nm-applet:29524): Gtk-CRITICAL **: 21:28:21.500: gtk_widget_destroy:
assertion 'GTK_IS_WIDGET (widget)' failed

(nm-applet:29524): Gtk-WARNING **: 21:28:21.570: Can't set a parent on
widget which has a parent

(nm-applet:29524): Gtk-CRITICAL **: 21:28:24.517: gtk_widget_destroy:
assertion 'GTK_IS_WIDGET (widget)' failed

(nm-applet:29524): Gtk-CRITICAL **: 21:28:24.517: gtk_widget_destroy:
assertion 'GTK_IS_WIDGET (widget)' failed

(nm-applet:29524): Gtk-WARNING **: 21:28:24.655: Can't set a parent on
widget which has a parent

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: network-manager-gnome 1.8.10-2ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: MATE
Date: Thu Mar  8 21:27:56 2018
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
SourcePackage: network-manager-applet
UpgradeStatus: No upgrade log present (probably fresh install)
WpaSupplicantLog:
 
nmcli-nm:
 RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI  
   WWAN-HW  WWAN    
 running  1.10.4   connected  started  full          enabled     enabled  
enabled  enabled  enabled

** Affects: network-manager-applet (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1754458

Title:
  applet symbol not displayed on mate (18.04)

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