In my ISPConfig3 installation, VServer is not available even if enabled in System> Server services.
I noticed that there is a checkbox in the website configuration labeled "Ruby" which should enable Ruby on a single site, and there is /usr/lib/ruby/1.8.
If so, could it be enough to install Ruby 1.9?
Since ISPConfig overwrites the Apache configuration, perhaps there is also this problem.
Thanks for any help.