Install zend-framework-bin and edit /etc/php5/conf.d/zend-framework.ini
uncommenting the second line which changes the include path.
After that, try to start apache in debug mode and you will find that crash.
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apache2 crashed with SIGSEGV in sapi_getenv()
** Changed in: apache2 (Ubuntu)
Status: Incomplete = Confirmed
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apache2 crashed with SIGSEGV in sapi_getenv()
https://bugs.launchpad.net/bugs/531706
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