[Bug 1560411] [NEW] update-notifier does not show new updates in xubuntu 16.04

[Ulli Horlacher]

Public bug reported:

This is on Xubuntu 16.04 beta 1:

update-notifier does not show anything on the desktop, though there are
pending updates: 

tux at tux:~: update-notifier  --debug-updates
(update-notifier:4752): update-DEBUG: update_check()
(update-notifier:4752): update-DEBUG: /usr/lib/update-notifier/apt-check returned 50 (security: 0)
(update-notifier:4752): update-DEBUG: is_package_system_locked: /usr/lib/update-notifier/package-system-lockedreturned 0
(update-notifier:4752): update-DEBUG: interval_days: 7
(update-notifier:4752): update-DEBUG: last_launch: 0 (Thu Jan  1 01:00:00 1970)
(update-notifier:4752): update-DEBUG: mtime from /var/log/dpkg.log: 1458573874 (Mon Mar 21 16:24:34 2016)
(update-notifier:4752): update-DEBUG: ctime from /var/log/dpkg.log: 1458573874 (Mon Mar 21 16:24:34 2016)
(update-notifier:4752): update-DEBUG: last_launch from /var/log/dpkg.log: 1458573874 (Mon Mar 21 16:24:34 2016)
(update-notifier:4752): update-DEBUG: mtime from /var/log/apt/term.log: 1458573874 (Mon Mar 21 16:24:34 2016)
(update-notifier:4752): update-DEBUG: ctime from /var/log/apt/term.log: 1458573874 (Mon Mar 21 16:24:34 2016)
(update-notifier:4752): update-DEBUG: last_launch from /var/log/apt/term.log: 1458573874 (Mon Mar 21 16:24:34 2016)
(update-notifier:4752): update-DEBUG: time now 1458639476 (Tue Mar 22 10:37:56 2016), delta: 65602

root at tux:# aptitude update
Get: 1 http://de.archive.ubuntu.com/ubuntu xenial InRelease [116 kB]
Hit http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease
Get: 2 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages [1,442 kB]
Get: 3 http://de.archive.ubuntu.com/ubuntu xenial/main i386 Packages [1,437 kB]
Get: 4 http://de.archive.ubuntu.com/ubuntu xenial/main Translation-en [732 kB]
Get: 5 http://de.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [7,246 kB]
Get: 6 http://de.archive.ubuntu.com/ubuntu xenial/universe i386 Packages [7,227 kB]
Get: 7 http://de.archive.ubuntu.com/ubuntu xenial/universe Translation-en [4,186 kB]
Fetched 22.4 MB in 3s (6,361 kB/s)

Current status: 83 (+3) new.

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

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https://bugs.launchpad.net/bugs/1560411

Title:
  update-notifier does not show new updates in xubuntu 16.04

Status in update-notifier package in Ubuntu:
  New

Bug description:
  This is on Xubuntu 16.04 beta 1:

  update-notifier does not show anything on the desktop, though there are
  pending updates: 

  tux at tux:~: update-notifier  --debug-updates
  (update-notifier:4752): update-DEBUG: update_check()
  (update-notifier:4752): update-DEBUG: /usr/lib/update-notifier/apt-check returned 50 (security: 0)
  (update-notifier:4752): update-DEBUG: is_package_system_locked: /usr/lib/update-notifier/package-system-lockedreturned 0
  (update-notifier:4752): update-DEBUG: interval_days: 7
  (update-notifier:4752): update-DEBUG: last_launch: 0 (Thu Jan  1 01:00:00 1970)
  (update-notifier:4752): update-DEBUG: mtime from /var/log/dpkg.log: 1458573874 (Mon Mar 21 16:24:34 2016)
  (update-notifier:4752): update-DEBUG: ctime from /var/log/dpkg.log: 1458573874 (Mon Mar 21 16:24:34 2016)
  (update-notifier:4752): update-DEBUG: last_launch from /var/log/dpkg.log: 1458573874 (Mon Mar 21 16:24:34 2016)
  (update-notifier:4752): update-DEBUG: mtime from /var/log/apt/term.log: 1458573874 (Mon Mar 21 16:24:34 2016)
  (update-notifier:4752): update-DEBUG: ctime from /var/log/apt/term.log: 1458573874 (Mon Mar 21 16:24:34 2016)
  (update-notifier:4752): update-DEBUG: last_launch from /var/log/apt/term.log: 1458573874 (Mon Mar 21 16:24:34 2016)
  (update-notifier:4752): update-DEBUG: time now 1458639476 (Tue Mar 22 10:37:56 2016), delta: 65602

  root at tux:# aptitude update
  Get: 1 http://de.archive.ubuntu.com/ubuntu xenial InRelease [116 kB]
  Hit http://security.ubuntu.com/ubuntu xenial-security InRelease
  Hit http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
  Hit http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Get: 2 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages [1,442 kB]
  Get: 3 http://de.archive.ubuntu.com/ubuntu xenial/main i386 Packages [1,437 kB]
  Get: 4 http://de.archive.ubuntu.com/ubuntu xenial/main Translation-en [732 kB]
  Get: 5 http://de.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [7,246 kB]
  Get: 6 http://de.archive.ubuntu.com/ubuntu xenial/universe i386 Packages [7,227 kB]
  Get: 7 http://de.archive.ubuntu.com/ubuntu xenial/universe Translation-en [4,186 kB]
  Fetched 22.4 MB in 3s (6,361 kB/s)

  Current status: 83 (+3) new.

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