This bug was fixed in the package unity - 5.16.0-0ubuntu1

---------------
unity (5.16.0-0ubuntu1) precise-proposed; urgency=low

  [ Łukasz 'sil2100' Zemczak ]
  * debian/control:
    - Update libgeis-dev and libgrail-dev dependencies in debian/control
  * New upstream release.
    - launcher is not refreshed after user session switch (LP: #1016430)
    - Dragging windows around is slow/sluggish/laggy when multiple monitors
      are enabled (LP: #874619)
    - Dragging icons to reorder -away from launcher causes the dragged icon
      image edges to fade away(cut off) (LP: #1026247)
    - Arrow for indicating lenses points empty space on alt+F2 (LP: #998752)
    - Tooltips backgrounds are not refreshed (no active blur) (LP: #967112)
    - [regression] Unity panel transparency (active blur) not updating properly
      (LP: #865006)
    - [Regression] Hideous low-res icon when using the HUD with autohide
      enabled. (LP: #1035951)
    - Launcher dragged icon is not redrawn when the mouse pointer is not moved
      (LP: #1032700)
    - Black background around after dash is restored (LP: #992516)
    - Refreshing active blur makes the dash painfully slow (LP: #874230)
    - [SRU regression] alt-grave not switching to next window unless 'grave'
      pressed twice (LP: #1035668)
    - [SRU Regression] Unity 5.14 + Nux 2.14: Launcher tooltips are
      incomplete/missing (LP: #1034164)
    - [nvidia] unity crashed in
      nux::GraphicsEngine::QRP_GLSL_1Tex (glDrawArrays) (LP: #1031554)
    - compiz crashed with SIGSEGV in
      unity::ui::EdgeBarrierController::Impl::OnPointerBarrierEvent()
      (LP: #1020075)
    - Much slower OpenGL frame rates with unityshell loaded, than plain compiz
      (LP: #988079)
    - Compiz won't start if "unredirect fullscreen windows" is enabled
      (LP: #980663)
    - [regression] Unity launcher on-screen corruption on resume from suspend
      with nVidia proprietary driver (LP: #915265)
    - Desktop, Launcher and menu bar still visible when screen locked
      (LP: #886605)
    - Unity is visible on top of fullscreen apps (LP: #734908)
    - [nvidia] compiz crashed with SIGSEGV in
      nux::BasePainter::PaintBackground (LP: #982626)
    - Update dependency on the renamed libgeis

  [ Didier Roche ]
  * debian/control:
    - build-dep on latest nux as libgeis-dev and libutouch-geis-dev are
      conflicting (LP: #1047385)
 -- Lukasz 'sil2100' Zemczak <[email protected]>   Tue, 11 Sep 2012 
10:53:17 +0200

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

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https://bugs.launchpad.net/bugs/1020075

Title:
  compiz crashed with SIGSEGV in
  unity::ui::EdgeBarrierController::Impl::OnPointerBarrierEvent()

Status in Unity:
  Fix Released
Status in Unity 5.0 series:
  Fix Committed
Status in “unity” package in Ubuntu:
  Fix Released
Status in “unity” source package in Precise:
  Fix Released

Bug description:
  [Test Case]
  No clear test case. Ensure that unity does not crash when adjusting screen 
settings or after login.

  [Regression Potential]
  Launchers not put correctly on multiple monitors, edge barriers broken.

  Original description:

  This happened when adjusting my second monitor to be twin view and w/o
  sticky edges.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: compiz-core 1:0.9.8+bzr3249-0ubuntu2
  ProcVersionSignature: Ubuntu 3.5.0-2.2-generic 3.5.0-rc4
  Uname: Linux 3.5.0-2-generic x86_64
  ApportVersion: 2.2.5-0ubuntu1
  Architecture: amd64
  Date: Mon Jul  2 07:34:15 2012
  Disassembly: => 0x3d77:       Cannot access memory at address 0x3d77
  ExecutablePath: /usr/bin/compiz
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120629)
  ProcCmdline: compiz
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x3d77:        Cannot access memory at address 0x3d77
   PC (0x00003d77) not located in a known VMA region (needed executable region)!
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: compiz
  StacktraceTop:
   ?? ()
   
unity::ui::EdgeBarrierController::Impl::OnPointerBarrierEvent(unity::ui::PointerBarrierWrapper*,
 std::shared_ptr<unity::ui::BarrierEvent>) () from 
/usr/lib/compiz/libunityshell.so
   sigc::internal::slot_call2<sigc::bound_mem_functor2<void, 
unity::ui::EdgeBarrierController::Impl, unity::ui::PointerBarrierWrapper*, 
std::shared_ptr<unity::ui::BarrierEvent> >, void, 
unity::ui::PointerBarrierWrapper*, std::shared_ptr<unity::ui::BarrierEvent> 
>::call_it(sigc::internal::slot_rep*, unity::ui::PointerBarrierWrapper* const&, 
std::shared_ptr<unity::ui::BarrierEvent> const&) () from 
/usr/lib/compiz/libunityshell.so
   unity::ui::PointerBarrierWrapper::EmitCurrentData() () from 
/usr/lib/compiz/libunityshell.so
   ?? () from /usr/lib/compiz/libunityshell.so
  Title: compiz crashed with SIGSEGV in 
unity::ui::EdgeBarrierController::Impl::OnPointerBarrierEvent()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  XsessionErrors:
   (compiz:1883): GConf-CRITICAL **: gconf_client_add_dir: assertion 
`gconf_valid_key (dirname, NULL)' failed
   gnome-session[1806]: WARNING: Application 'compiz.desktop' killed by signal 
11
   gnome-session[1806]: WARNING: App 'compiz.desktop' respawning too quickly
   gnome-session[1806]: CRITICAL: We failed, but the fail whale is dead. 
Sorry....
   (compiz:2518): GConf-CRITICAL **: gconf_client_add_dir: assertion 
`gconf_valid_key (dirname, NULL)' failed

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