Dear Users, the below links are interesting if you want to install in linux.

http://www.warp11.nl/2011/05/fully-freeware-apex-environment-vi-oracle-http-server-installation/

http://www.warp11.nl/2011/05/fully-freeware-apex-environment-vii-oracle-http-server-configuration/

Thanks to Balaji-PixelByte who has referred this http://www.warp11.nl/