Same problem here. I had nm-applet icon showing up just fine on 17.04. After upgrading to 17.10 it disappeared, but I was able to get it back by using MATE Tweak to revert to a saved panel layout. Now, after upgrading to 18.04, it disappeared again. I am still able to recover it by reverting to a saved panel layout, but now I have to do it every single time I restart my computer.
If I add the Indicator Applet, I can get *a* network icon to show up, but it isn't the same as nm-applet, as it lacks a lock icon when using a VPN (and likely other differences). If I run sudo nm-applet, I get similar error messages to the ones already posted, though the icon does display while I have the terminal open and the command running. Here's my error message when running sudo nm-applet (running it without sudo generates no error, but also doesn't bring back the icon): (nm-applet:2874): Gtk-WARNING **: 09:19:30.075: Can't set a parent on widget which has a parent (nm-applet:2874): Gdk-CRITICAL **: 09:19:30.274: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed -- 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 : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
