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Why is /usr/bin/env permission denied to rails server?

I've just set up rails on an apache server running on Ubuntu, and when I try to go to the root page it gives this error: An error occurred while starting up the preloader. It exited before signalling ...
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Group Policy Preferences - Dynamic Environment Values

Is it possible to configure dynamic values within group policy preferences for environment variables? I am trying to replace our old login scripts which set an env var according to the computer ...
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How to set header for non-self-referencing URI in Apache?

I have to cache web pages with URL path teacher and student like so: <LocationMatch "^/(teacher|student)/"> Header set Cache-Control "private, max-age=60" </LocationMatch> However, ...