Missing indicator icons after first login

[seanlano]

This is a fresh install of 16.04.
When the computer first boots, the greeter correctly shows all the indicator icons in the top right (i.e. accessibility, time, power menu). After the first login, then going back to the greeter either by logging out or by switching user, only the accessibility indicator is shown. Most importantly, this means the power menu cannot be used after logging out.
I have this happening on two machines, both with fresh installs of 16.04. One is a desktop machine with an nVidia GPU and the other is a laptop with Intel HD3000 GPU, both show the same problem.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity-greeter 16.04.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Jul 31 12:54:29 2016
InstallationDate: Installed on 2016-07-03 (28 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: unity-greeter
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Duke (duke1995)]

I have the same problem, but after an upgrade from 14.04 to 16.04.

[mike (intronic)]

Same for me, new install of: Ubuntu 16.04.1 LTS