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[shoohuy <1455662@xxxxxxxxxxxxxxxxxx>]

I have Xubuntu, with 3G modem internet (mobile broadband).
When I did a release-upgrade from 14.10 to 15.04, the nm-applet icon permanently disappeared. (After the lightdm logon, the nm-applet is visible for a few seconds, but then disappears.)
"sudo service network-manager stop && sleep 10 && sudo service network-manager start" does NOT get it back. Rebooting neither.
The "sudo nmcli connection up XX" works, this is the only way to access the internet.

$ sudo nm-applet
(nm-applet:3579): nm-applet-WARNING **: Cannot grab information for modem at /org/freedesktop/ModemManager1/Modem/0: No ModemManager support
(nm-applet:3579): nm-applet-WARNING **: ModemManager is not available for modem at /org/freedesktop/ModemManager1/Modem/0

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Packages, which is subscribed to network-manager-applet in Ubuntu.
https://bugs.launchpad.net/bugs/1455662

Title:
  nm-applet icon disappears from menu bar requiring 'sudo service
  network-manager stop; sudo service network-manager start' to get back.

Status in network-manager-applet package in Ubuntu:
  Confirmed

Bug description:
  Occasionally when changing Wi-Fi networks the nm-applet icon in the
  menu bar will disappear and require a reboot to get back. On previous
  releases I could simply killall nm-applet; nm-applet & and it would
  reappear but that workaround no longer works.

  Find my self rebooting at least once every two days because I lose nm-
  applet. This problem seemed to start upon upgrading to Vivid.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager-gnome 0.9.10.1-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri May 15 14:21:15 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2013-11-06 (555 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: network-manager-applet
  UpgradeStatus: Upgraded to vivid on 2015-04-27 (18 days ago)
  nmcli-con: Error: command ['nmcli', '-f', 'all', 'con'] failed with exit code 9: Error: nmcli (0.9.10.0) and NetworkManager (unknown) versions don't match. Force execution using --nocheck, but the results are unpredictable.
  nmcli-dev: Error: command ['nmcli', '-f', 'all', 'dev'] failed with exit code 8: Error: NetworkManager is not running.
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

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