Some hints to resolve a "Post Setup Configuration Failed" error when installing FAST Search Server 2010 for SharePoint.
By checking the log from the post-installation script (<FASTSearchFolder>\installer\scripts\psconfig.ps1) on each failure, you may find these errors:
This issue may be related to multi-core cpu's. Resolved this by reducing logical number of CPUs(Core) instead of changing BIOS http://support.microsoft.com/kb/2449600
or: REMOVE the ftp_Schema.xml file from the c:\windows\system32\inetsrv\config\schema directory in order for the install to properly proceed with the install.
It seems an iis role service was missing – “URL Authorization”. http://social.technet.microsoft.com/Forums/en-IN/sharepoint2010setup/thread/a5d511ab-3993-4b03-8d64-8e6fde36b3a8 http://learn.iis.net/page.aspx/142/understanding-iis-70-url-authorization/
Some security hardening may be done on the server, and "Secondary Logon" was disabled. This service allows you to have the "run as" functionality. It seems disabling this service is one of many factors in server security hardening; however FAST requires this service to run configuration as the account specified during install. http://blogs.msdn.com/b/briangre/archive/2011/02/24/fast-search-for-sharepoint-configuration-failure.aspx
This problem may occur if Group Policy exists that does not have the Create Global Objects policy set http://blogs.msdn.com/b/briangre/archive/2011/02/24/fast-search-for-sharepoint-configuration-failure.aspx
(Thanks to Paul Kelly for the information)
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