My server is:

Server version: Apache/2.2.11 (Ubuntu)
Server built:   Aug 16 2010 17:44:11

My ruby version ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-linux].

I've installed passenger 3.0.7 via RubyGems. I've run passenger-install-apache2-module and everything went fine. I've modified configuration (load module, edit virtualhost etc.) and restarted Apache. Module is loading fine (apache does not complain). But Passenger is obviously not working:

sudo passenger-status
ERROR: Phusion Passenger doesn't seem to be running.

How can I get it working ?

Edit 1:

/etc/apache2/mods-enabled/passenger.load

LoadModule passenger_module /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.7/ext/apache2/mod_passenger.so

Root of passenger:

passenger-config --root
/usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.7

Apache VirtualHost sub URI configuration in /etc/apache2/sites-enabled/railsapps:

<VirtualHost <IP ADDRESS>:80>                                                                                                                                                                                    
    ServerAdmin webmaster@localhost
    ServerName my.server.name

    PassengerRoot /usr/lib/ruby/gems/1.9.1/gems/passenger-3.0.7
    PassengerRuby /usr/bin/ruby
    RailsEnv development

    DocumentRoot /www/vhosts/railsapps

    <Directory /www/vhosts/railsapps>
        Options FollowSymlinks -MultiViews
        AllowOverride None
        Order allow,deny
        Allow from all
    </Directory>

    RailsBaseURI /siteA
    <Directory /www/vhosts/railsapps/siteA>
        Options -MultiViews
        AllowOverride All
        Order allow,deny
        Allow from all
    </Directory>

    RailsBaseURI /siteB
    <Directory /www/vhosts/railsapps/siteB>
        AllowOverride All
        Options -MultiViews
        Order allow,deny
        Allow from all
    </Directory>

    LogLevel info

    ErrorLog /var/log/apache2/railsapps_error.log
    CustomLog /var/log/apache2/railsapps_access.log combined

</VirtualHost>

Of course as in 'users guide apache.html' siteA and siteB are symlinks to siteA/public and siteB/public absolute paths respectively.

Edit 2:

In logs there is nothing related to passenger. Permissions are also fine (read and executable) on directories in paths. Even if it was some misconfiguration or permission problem isn't passenger suppose to be running? I mean sudo passenger-status should at least output --- general information ---. When I place some test html file in railsapps directory it is served fine.

/var/log/apache2/railsapps_error.log

[Sun Jun 19 12:19:08 2011] [error] [client <IP>] Directory index forbidden by Options directive: /www/vhosts/railsapps/siteA/
[Sun Jun 19 12:19:08 2011] [error] [client <IP>] File does not exist: /www/vhosts/railsapps/favicon.ico