[Bug 1246364] Re: update-notifier does not show a tray icon in xubuntu

[Forest]

Clarification: I split my changes into two patches. They both still work
on the latest release.

My patches simply restore code that was removed a while back, so it's
pretty safe to consider them already-tested.  They don't change the
default behavior, so applying them shouldn't affect current users unless
they specifically enable the restored functionality.

In other words, these patches should be fairly easy to validate and safe
to apply.

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https://bugs.launchpad.net/bugs/1246364

Title:
  update-notifier does not show a tray icon in xubuntu

Status in One Hundred Papercuts:
  Confirmed
Status in update notifier:
  New
Status in update-notifier package in Ubuntu:
  Confirmed

Bug description:
  update-notifier does not show a tray icon/notification in xubuntu 13.10 anymore. Instead the software updater window appears minimized, when updates are available.
  Additionally I tried to trigger the 'System Restart Required'-notification manually by adapting /var/run/reboot-required, but no notification was displayed (although it shows up in motd).
  As a side note: I got a 'there is something wrong with updates'-notification by removing update-notifier-common while update-notifier was running.

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