i found more info in /var/crash/_usr_bin_metacity.1000.crash:

Title: metacity crashed with SIGABRT in raise()
UnreportableReason: The program crashed on an assertion failure, but the 
message could not be retrieved. Apport does not support reporting these crashes.
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1132): GLib-CRITICAL **: 
g_once_init_leave: assertion `initialization_value != 0' failed

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metacity crash with alt + spacebar
https://bugs.launchpad.net/bugs/559004
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