[Bug 1590718] [NEW] update-notifier doesn't show all updates

[faustus69]

Public bug reported:

update-notifier doesn't launch when there are pending updates.

If you run "apt update" it launchs, but shows less updates than "apt
list --upgradable".

I atttached result from "apt list --upgradable" and a screenshot from
update-notifier.

System is Xubuntu 16.04.

This behaviour wasn't observed in Xubuntu 14.04.

** Affects: update-notifier (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "result from "apt list --upgradable""
   https://bugs.launchpad.net/bugs/1590718/+attachment/4680301/+files/apt_list_--upgradable.txt

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https://bugs.launchpad.net/bugs/1590718

Title:
  update-notifier doesn't show all updates

Status in update-notifier package in Ubuntu:
  New

Bug description:
  update-notifier doesn't launch when there are pending updates.

  If you run "apt update" it launchs, but shows less updates than "apt
  list --upgradable".

  I atttached result from "apt list --upgradable" and a screenshot from
  update-notifier.

  System is Xubuntu 16.04.

  This behaviour wasn't observed in Xubuntu 14.04.

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