[Bug 1671540] [NEW] Software Updater window is invisible

[teo1978]

Public bug reported:

The software Updater icon has just appeared in my Launcher (it's
probably trying to tell me that there are updates available, but who
knows really). However, the window cannot be accessed in any way.

By clicking on the launcher icon, a small arrow appears on the right of
it, and the title "Software Updater" appears on the top screen title bar
(see screenshot), but no window becomes visible.

By hitting Alt+Tab, Software Updater is not even in the list of the
available windows: this is an inconsistency that, no matter whether or
not there's a bug in Software Updater itself, reveals a lower level bug
in Unity (or whatever system component is responsible for switching
windows), as there must ALWAYS be a 1:1 correspondence between open
windows listed in Launcher and windows available via Alt+TAB.

I don't know whether this is related to #1671529, but there is a
difference (I'm almost sure of): in the case of 1671529 the window was
available via Alt+TAB, though it wouldn't show up if selected.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: update-manager 1:16.04.5
ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar  9 17:07:38 2017
DpkgHistoryLog.txt:
 
DpkgTerminalLog.txt:
 
GsettingsChanges:
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'378'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'484'
 b'com.ubuntu.update-manager' b'launch-time' b'1489072980'
InstallationDate: Installed on 2013-10-11 (1244 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to xenial on 2016-12-11 (87 days ago)

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


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1671540

Title:
  Software Updater window is invisible

Status in update-manager package in Ubuntu:
  New

Bug description:
  The software Updater icon has just appeared in my Launcher (it's
  probably trying to tell me that there are updates available, but who
  knows really). However, the window cannot be accessed in any way.

  By clicking on the launcher icon, a small arrow appears on the right
  of it, and the title "Software Updater" appears on the top screen
  title bar (see screenshot), but no window becomes visible.

  By hitting Alt+Tab, Software Updater is not even in the list of the
  available windows: this is an inconsistency that, no matter whether or
  not there's a bug in Software Updater itself, reveals a lower level
  bug in Unity (or whatever system component is responsible for
  switching windows), as there must ALWAYS be a 1:1 correspondence
  between open windows listed in Launcher and windows available via
  Alt+TAB.

  I don't know whether this is related to #1671529, but there is a
  difference (I'm almost sure of): in the case of 1671529 the window was
  available via Alt+TAB, though it wouldn't show up if selected.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: update-manager 1:16.04.5
  ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
  Uname: Linux 4.4.0-64-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar  9 17:07:38 2017
  DpkgHistoryLog.txt:
   
  DpkgTerminalLog.txt:
   
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'378'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'484'
   b'com.ubuntu.update-manager' b'launch-time' b'1489072980'
  InstallationDate: Installed on 2013-10-11 (1244 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to xenial on 2016-12-11 (87 days ago)

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