Where is Apache installed on Ubuntu?

Linux

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Apache config files are in /etc/apache
Apache log files are in /var/log/apache
Apache libs are in /usr/lib/apache
Other files can be in /usr/share/apache, /var/lib/apache

Also you can always use command "locate apache" to get more info where your program files are.

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fuente: http://ubuntuforums.org/showthread.php?t=356951