[Bug 1602321] [NEW] onboard fails to start - Mint 18 Cinnamon 64bit

[pon tech]

Public bug reported:

$ lsb_release -rd
Description:	Linux Mint 18 Sarah
Release:	18


$ onboard -d
Traceback (most recent call last):
  File "/usr/bin/onboard", line 35, in <module>
    from Onboard.OnboardGtk import OnboardGtk as Onboard
  File "/usr/lib/python3/dist-packages/Onboard/OnboardGtk.py", line 35, in <module>
    require_gi_versions()
  File "/usr/lib/python3/dist-packages/Onboard/Version.py", line 30, in require_gi_versions
    gi.require_version('AppIndicator3', '0.1')
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 102, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace AppIndicator3 not available

Attempts to start but fails.
Too new to understand how to get it to work, but need it due to handicap.

** Affects: onboard (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1602321

Title:
  onboard fails to start - Mint 18 Cinnamon 64bit

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