Comment 4 for bug 1301158

i am affected too. it was there after the install; but disappeared after booting.
tried nm-applet; did not reappear.
 deleted the indicator plug in form the panel and re-added it. now, its back.
$ lsb_release -rd
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
$ apt-cache policy network-manager
network-manager:
  Installed: 0.9.8.8-0ubuntu5
  Candidate: 0.9.8.8-0ubuntu7
  Version table:
     0.9.8.8-0ubuntu7 0