dead shortcuts i.e. Alt+F1; gconf-editor crashed with SIGSEGV in gconf_value_copy()

 lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04
apt-cache policy gconf-editor
gconf-editor:
  Installiert: 3.0.1-1ubuntu1
  Kandidat: 3.0.1-1ubuntu1
  Versionstabelle:
 *** 3.0.1-1ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

The crash of gconf-editor was the result of looking for the reason, why my windows do not react on commands like Alt+F10, Alt+F8, Alt+F7, Alt+F4 Alt+Tab and so on. Clicking through thousands of possibilities gconf-editor suddenly crashed. I cannot reproduce the failure. I think this is not important.

Important is the system noreaction to basical shortcuts, only theSuper/Mode4/Windows-Key gives a result with the dash. Even Alt+F1 or Alt+F2 are dead.

If my crash-report is not correctly on this place, I ask you kindly to send it to that part of ubuntu, who has to be busy with these problem of Alt+F1 and so on.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gconf-editor 3.0.1-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
Date: Sun Mar 11 13:42:41 2012
ExecutablePath: /usr/bin/gconf-editor
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111130.1)
ProcCmdline: gconf-editor
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb774ca76 <gconf_value_copy+38>: mov (%edi),%eax
 PC (0xb774ca76) ok
 source "(%edi)" (0x00000033) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gconf-editor
StacktraceTop:
 gconf_value_copy () from /usr/lib/i386-linux-gnu/libgconf-2.so.4
 ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 g_boxed_copy () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 g_value_set_boxed () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 gtk_tree_model_get_value () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
Title: gconf-editor crashed with SIGSEGV in gconf_value_copy()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo