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The thing is I installed Ubuntu 12.04, Java (for Eclipse), Eclipse, ruby, ruby gems, rails. Everything went smooth. When I tried to prepare Eclipse for ruby on rails, I installed ruby dev kit plugin. This worked, but RadRails failed with this error:

Cannot complete the install because one or more required items could not be found.
Software currently installed: org.radrails.rails-feature 0.7.2 ( 0.7.2)
Missing requirement: Rails Core Plug-in 0.7.2 (org.radrails.rails.core 0.7.2) requires 'bundle org.eclipse.update.core 0.0.0' but it could not be found
Cannot satisfy dependency:
From: org.radrails.rails-feature 0.7.2 ( 0.7.2)
To: org.radrails.rails.core [0.7.2]
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I also had the same problem and solved it. You copy package org.eclipse.update.core of version Indigo into the folder plugin of this version. Radrails uses old API of eclipse, but Juno doesn't have it. This is not a bug, as you can see here at the official eclipse site.

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