This bug was fixed in the package unity - 5.20.0-0ubuntu2

---------------
unity (5.20.0-0ubuntu2) precise; urgency=low

  * Check to see if the window is supposed to have decorations instead
    of the window actually being decorated when Undecorate() is called.
    This fixes a regression from the previous SRU where windows opened
    maximized upon login could have extra decorations (LP: #1195730)

unity (5.20.0-0ubuntu1) precise; urgency=low

  * New upstream release.
    - ResultRendererTile: fix a crash if row.renderer<TextureContainer*>()
      is null (LP: #926658)
    - Fix unity launcher vanishes when switching to mirrored displays
      (LP: #991637)
    - Fix window decorations being drawn when they should not be.
      This fixes icaclient window "dancing" (LP: #1083186) and
      hides decoration in a test case with Steam (LP: #1122478)
    - [multimonitor] Dash - Opening dash or HUD on one screen removes panel
      shadow on the other (LP: #892718)
    - Press Alt+F1, panel’s shadow dissapear (LP: #942965)
  * Cherry-pick a manual test for decorations fix
 -- Christopher Townsend <[email protected]>   Mon, 08 Jul 
2013 09:37:30 -0600

** Changed in: unity (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/991637

Title:
  unity launcher vanishes when switching to mirrored displays

Status in OEM Priority Project:
  In Progress
Status in OEM Priority Project precise series:
  In Progress
Status in Unity:
  Fix Released
Status in Unity 5.0 series:
  Fix Released
Status in Unity 6.0 series:
  Fix Committed
Status in “unity” package in Ubuntu:
  Fix Released
Status in “unity” source package in Precise:
  Fix Released
Status in “unity” source package in Quantal:
  Confirmed
Status in “unity” source package in Raring:
  Fix Released

Bug description:
  On a fresh install of Ubuntu 12.04, Unity 5.10.0-0ubuntu6, if I switch
  my display settings from non-mirrored to mirrored, the launcher
  vanishes. Note that I have the launcher "auto-hide" setting disabled,
  so it should always be visible.

  [Test Case]
  Steps to reproduce:
  * Open System Settings -> Displays.
  * Make sure the launcher is only allowed to be shown on the external monitor.
  * Check "Mirror displays" checkbox.
  * Click "Apply".
  * Unity launcher vanishes. The only way I've found to restore it is to switch 
back to non-mirrored mode.

  [Regression Potential]
  None.

  Other applications are affected by the switch to mirrored mode. If a
  window is maximized prior to the mirroring, often it will take up a
  narrow vertical strip (maybe 20 pixels wide) on the right side of the
  screen - de-maximizing restores restores it to a window, but re-
  maximizing restores it to the narrow vertical strip.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: unity 5.10.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  Date: Sun Apr 29 21:22:41 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
  ProcEnviron:
   LANGUAGE=en_CA:en
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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