Lubuntu 14.04: The Network Manager icon doesn't show up by default for some users by default. Until the developers fix this, here's how to get the Network Manager icon back.
Get the Network Manager icon to show up on the panel in Lubuntu 14.04 LTS
To fix the Network Manager not showing up on the panel issue, from the Lubuntu menu select Preferences > Default applications for LXSession, then click on the Autostart tab and under "Manual autostarted applications" type "nm-applet", then click the "+ Add" button on the left:
Now log out, log back in and you should see the Network Manager icon on the panel:
fix somewhat via lffl.org