Thread:Project:Support desk/Installation issues No /etc/mediawiki directory/reply (3)

I've checked in the /var/log/apacahe2/error.log file, and I see this error:

[Fri Jan 23 13:51:02.156433 2015] [:error] [pid 16920] [client 127.0.0.1:53038] PHP Fatal error: require_once: Failed opening required '/var/lib/mediawiki/includes/Init.php' (include_path='.:/usr/share/php:/usr/share/pear') in /usr/share/mediawiki/includes/WebStart.php on line 94

I don't have a /var/lib/mediawiki/includes/Init.php file.

AND - what is /usr/share/mediawiki directory doing on my system ??? I unpacked the tgz file into /var/lib/mediawiki !!!!