How can you solve the error message at the last line?
.... # Installing MediaWiki with php file extensions # Environment checked. You can install MediaWiki. # Generating configuration file... # Database type: PostgreSQL # Loading class: DatabasePostgres # Attempting to connect to database "wikidb" as "wikiuser"... error: No database connection # Checking the version of Postgres... Warning: pg_version(): supplied argument is not a valid PostgreSQL link resource in /var/www/wiki/includes/db/DatabasePostgres.php on line 1078 FAILED. Required version is 8.1. You have 7.3 or earlier
I am using Postgres 8.3 which makes the error message strange. The file "LocalSettings.php" was not created to the directory config so I cannot continue the installation without solving the problem.