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[Tobias Lausch <tobias.lausch@xxxxxxxxxxx>]

ok, found and installed the unity-dbgsym and  libnux-4.0-0-dbgsym
but that does not change the backtrace, so I assume it's a compiz bug.

I followed https://wiki.ubuntu.com/DebuggingCompiz.
There they say to install compiz-core-dbgsym compiz-plugins-dbgsym compiz-fusion-plugins-main-dbgsym compiz-fusion-plugins-extra-dbgsym compizconfig-backend-gconf-dbgsym libcompizconfig0-dbgsym compiz-gnome-dbgsym

after adding the debug debs

 deb http://ddebs.ubuntu.com vivid main restricted universe multiverse
 deb http://ddebs.ubuntu.com vivid-updates main restricted universe multiverse
 deb http://ddebs.ubuntu.com vivid-proposed main restricted universe multiverse

and running apt-get update. ;-)

But there are not any compiz-dbgsym in the repositories.
any idea?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/1470097

Title:
  Unity does not support cpus without sse4

Status in Compiz:
  New
Status in Unity:
  Incomplete
Status in compiz package in Ubuntu:
  New
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  Unity uses sse4 instructions which are not available on older  celeron
  or pentium cpus.

  The instruction being used causing unity to crash is
  PEXTRD

  In this case one cannot login into the default unity session.
  current workaround is to install gnome.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: unity 7.3.2+15.04.20150420-0ubuntu1 [modified: usr/bin/unity]
  ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
  Uname: Linux 3.19.0-21-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: GNOME
  Date: Tue Jun 30 14:32:20 2015
  InstallationDate: Installed on 2015-06-29 (0 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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