Michael Greenly wrote:
> I'm betting there's a partially installed 'from source gems' there then?
> Make sure there's nothing in /usr/local/lib/site_ruby/gems or 
> /var/lib/gems
> before reinstalling.

well you are right about  a partially installed 'from source gems', but 
I removed everything in both directories

I ended with compiling ruby 1.9 myself and gem provided with it is ok. 
compiling ruby is pretty fast and harmless.
still, I don't understand why my standard ubuntu ruby installation was 
KO..
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