I have Blender 2.62 on my PC (running Ubuntu 12.04), and I'd like to start experimenting with the beautiful Cycles rendering engine.

From the tutorials I see that it is supposed to be available in the rendering engine dropdown. But I have only "Blender Render", "Blender Game" and greyed out "Engine" values there.

I read that Cycles is enabled by default since version 2.61. So, since I'm on 2.62 I guess there's some problem.

So, should I uninstall and install from fresh source, or there are some less drastic steps to be taken in order to enable the Cycles addon?

File > User pref. > Addons > Cycles Render Engine (enable it)
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I'm sitting, waiting, wishing, building Blender in superstition...

If I go to File > User pref. > Addons and search for Cycles, a warning entry appears:

Missing script files
[warning icon]cycles [x] (checkbox to disable the addon)

If I google for "blender Cycles missing script files"

Had to reinstall anyway, it seemed it would take too long time to fix this manually.