Yes I found this bug too. The bug arose after I did a clean full install of Mate 18.04LTS, but I re-used my old Mate 16.04 home partition. So it's probably confused by my old style configuration files which were imported from Mate16.04 to Mate 18.04.
The workaround of using Mate Tweak to switch the panel style to something else and then back to Traditional fixed the problem for me. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager-applet in Ubuntu. https://bugs.launchpad.net/bugs/1754458 Title: nm-applet symbol not displayed on mate (18.04) Status in ubuntu-mate: Confirmed Status in network-manager-applet package in Ubuntu: Confirmed Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1754458/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
