The offered solution of changing the panel style did not persist after restart. The following has solved the problem for me, with the solution persisting across sessions/restarts.
I discovered I had two version of the file: "indicator- application.desktop", apparently one from an earlier install. I removed the old version: sudo rm /usr/share/indicator-application/upstart/xdg/autostart /indicator-application.desktop I'm not sure if this actually contributed to the solution, the main fix was to start up the indicator applet with dbus-launch. I edited the other file: sudo pluma /usr/share/mate/autostart/indicator-application.desktop I changed the following line: Exec=/usr/lib/x86_64-linux-gnu/indicator-application/indicator- application-service To instead say this: Exec=dbus-launch /usr/lib/x86_64-linux-gnu/indicator-application /indicator-application-service That fixed the missing nm-applet icon in the tray. I had a program that automatically starts that puts an icon in the tray. Its icon was still not appearing in the tray, so I set it so that it is delayed at startup for 10 seconds until the tray and indicator applet is loaded. This seemed to fix the problem. To do this, from the Control Center, select "Startup Applications" (or directly edit the file in ~/.config/autostart). Edit the command that Ubuntu Mate uses to execute the program using the following code (and you can change 10 to whatever delay in seconds you'd like): sh -c "sleep 10 && NAME_OF_PROGRAM" -- 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
