When you navigate to www.mendix.com -> community -> documentation -> deployment -> How To: Mendix 2.5 on Linux you will be redirected to https://world.mendix.com/display/howto25/Mendix+2.5+on+Linux. This is not the right page, should be this: https://world.mendix.com/display/howto25/Installing+Mendix+2.5+on+GNU_Linux