My server has falled over [on hold]

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http://serverfault.com – My server has falled over since I have tried to install apc. I just have installed php-pear and apache2-prefork-mem. Now my server does not respond and don't know why. [Tue Aug 20 11:07:01.123491 2013] [core:notice] [pid 16080] AH00094: Command line: '/usr/sbin/apache2' [Tue Aug 20 11:14:33.510798 2013] [mpm_prefork:notice] [pid 16080] AH00169: caught SIGTERM, shutting down [Tue Aug 20 11:14:34.698790 2013] [mpm_prefork:notice] [pid 17880] AH00163: Apache/2.4.6 (Ubuntu) PHP/5.5.1-2+debphp.org~precise+2 configured -- resuming normal operations [Tue Aug 20 11:14:34.698977 2013] [core:notice] [p (HowTos)