Process samworker terminated shortly after starting

FAST Search Service fails to start after applying a Cumulative Update

If you apply a Cumulative Update to FAST Search Server 2010 for SharePoint don’t forget that you will have to execute a PowerShell script to apply the updates to your FAST Search deployment.

Install a software update (FAST Search Server 2010 for SharePoint)

If you need a reliable source to check for SharePoint 2010 Cumulative Updates I recommend you go to Todd Klindt’s site, he maintains a page dedicated to that.

SharePoint 2010 Build Numbers