I just installed 18.04, and there is no network icon at all, which makes it kind of hard to connect to wifi. I can run a CAT-5 upstairs and try to find a way to install that app, if it can be done.
Also, BTW, the Welcome window is missing.
Hi Frederick,
restart the live CD and choose āTry Ubuntu Mateā, you may have to restart a few times to get it to show but it should eventually!.
Failing that, you can manually set-up your network:
Top panel > System > Settings > Internet and network!. 
Thanks! I had some bad crashes, liike the desktop not loading, so I went back to 16.04, and will be more patient than to try a beta this soon!
Hi Frederick,
I did also have a couple of problems but there have been many more updates in the meantime.
Try a new daily build again and you should be good to go!.
http://cdimage.ubuntu.com/ubuntu-mate/daily-live/current/HEADER.html (Daily build from 18 march 2018).
Just installed the brand-new 18.04 UM. STILL no wireless icon, and running nm-applet gets this:
sudo nm-applet
(nm-applet:7473): Gtk-WARNING **: 03:34:41.380: Canāt set a parent on widget which has a parent
(nm-applet:7473): Gtk-CRITICAL **: 03:34:43.609: gtk_widget_destroy: assertion āGTK_IS_WIDGET (widget)ā failed
(nm-applet:7473): Gtk-CRITICAL **: 03:34:43.609: gtk_widget_destroy: assertion āGTK_IS_WIDGET (widget)ā failed
(nm-applet:7473): Gtk-WARNING **: 03:34:43.621: Canāt set a parent on widget which has a parent
This is nonsensical to me. Why, when the installation disk has a wireless icon allowing a network to be selected and a password entered, does the installation, when booted, show no wireless icon?
I mean, itās a good thing I have a long CAT-5 cable, but I shouldnāt have to connect with Ethernet!
CAN anything be done about this? It was also present in the beta, and I had expectations that it wouldnāt be in the final release.
This sounds like a mismatch between the older notification area used in your older saved panel layout and the newer indicators, now used by default. Your best bet is probably to re-create your panel layout based on one that uses indicators (that's what I did), or you will need to manually tweak things. See this thread (I haven't tried it personally):
Yes, If I do run nm-applet, the wifi networks do show up. It did allow me to connect wirelessly, but I really do not want to have to run this every time I reboot.
I solved this in 18.04 final by adding to Panel āIndicator Applet Completeā ā it has Bluetooth, Network, Battery, Volume and Session. The old āNotification Areaā is still there, and it has Skype showing. At first everything else was missing, but now Volume has showed up again. I have 2 Volume controls, which I can ignore.
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You can also run the following terminal command in case of missing dependencies?:
sudo apt update && sudo apt dist-upgrade -f
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I managed to make the network, keyboard and sound icons show again in the taskbar by doing the following and it doesn't require to re-run it each time you reboot:
editing /etc/xdg/autostart/nm-applet.desktop and changed
Exec=nm-applet
to
Exec=dbus-launch nm-applet
My nm-applet.desktop file looks like this:
[Desktop Entry]
Name=Network
Comment=Manage your network connections
Icon=nm-device-wireless
Exec=dbus-launch nm-applet
Terminal=false
Type=Application
NoDisplay=true
NotShowIn=KDE;GNOME;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=NetworkManager
X-GNOME-Bugzilla-Component=nm-applet
X-GNOME-UsesNotifications=true
X-Ubuntu-Gettext-Domain=nm-applet
I tried this but I only get to see the following, missing the network connection:
Does it still work for you? I see that a bug has been reported...
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Yes, the complete indicator applet is working for me.
I tried a panel reset with right mouse click but that didnāt help either. 
Are you sure you added āIndicator Applet Completeā? There is another one called āIndicator Appletā that shows only some, presumably those that have current notifications.
Yes. 
I just tried it again, same result.
This worked to me Ubuntu 16.04 Mate 1.12.1
I added "sudo" in front of "nm-applet" in "modify starting program" !
I think that the problem is when you upgrade from a previous version of Ubuntu Mate to 18.04. The top panel with the menu bar has changed in the latest version, and this causes conflicts.
To fix all the issues, just right-click on the top panel and press āReset panelā. From that point, youāll see that the menu has changed and that the āIndicator Appletā is the new widget for all your network, bluetooth and other options.
Moreover, I was also having problems with the (Caja) Dropbox icon not showing up, and now everything seems correct.
I hope this helps!
3 Likes
The reset panel worked great ! thanks a lot.
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Thanks SRG, your tip about resetting the panel caused my owncloud (nextcloud) icon to show up and restored my missing network icon at the same time. 
Also, thanks to any devs who might have been working behind the scenes to make this possible.
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Somehow, last week my system apparently hosed itself. SOMETHING happened, and the unbootable system had a blank disk. NO idea how it happened; this is expected with Windows.
Anyway, a complete installation was in order. Now, the network icon is present.
Fortunately, I have gotten used to compiling Aqualung, my go-to music player for a radio show.
Left the Ubuntu repos some time ago. A PPA was up, but it doesnāt have a Bionic version.
Hi all, I had this exact same problem. I fixed it by simply going to the very top bar, right clicking and then selecting reset panel. This brought back the complete panel for me. Hope this helps!