I installed Ubuntu 14.04 LTS on Lenovo Think-pad laptop some months ago. Everything has been working fine until yesterday. Don't know whether something hasn't updated correctly. Very new to Ubuntu and non-technical. Tried following thread for this problem by following instructions:
sudo apt-get install libappindicator1
enter and received message that not all "information" could be recovered from archives, or something like that continued with the following instructions in Terminal:
sudo apt-get install --reinstall ubuntu-desktop sudo apt-get install unity sudo shutdown -r now
After shutting down I restarted, but the network menu was still not there. Then I followed instructions in Ubuntu help to get error messages from Terminal as follows:
(nm-applet:2379): WARNING: Could not initialize NMClient /org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was not provided by any .service files
(nm-applet2379): nm-applet-WARNING: Error connecting to ModemManager: Error calling StartServiceByName for org.freedesktop.Modem-Manager1: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ExecFailed: Cannot launch daemon,file not found or permission invalid
(nm-applet:2379): nm-applet-WARNING: Could not find ShellVersion property on org.gnome.Shell after 5 tries
(nm-applet:2379): nm-applet-WARNING: Failed to register as an agent: (2) The name org.freedesktop.NetworkManager was not provided by any .service files
Similar error messages were also generated in the Terminal before I tried the troubleshooting steps found in the thread but the
nm-applet number was 2867, not 2379.
I only have Ubuntu installed on my Lenovo laptop but also run a separate laptop with MS Windows with no internet connection issues, so I know there is not problem with my Wifi.