I would try 

rvm get head

that will update RVM to the latest. Then 

rvm install 1.9.2

I know you have it installed, but do it again to get the latest version. Then:

git update --system

Then 

gem install cassandra

And then read, parse, and act on the results of that last command. If it says 
something like, "Install failed, install log is here with the results of that 
failure" then locate and read that install log. Try to take each error one at a 
time, and resolve it. You may have to go back to the gem install cassandra line 
many, many times, once per thing you change from the install errors log. 

This part of compiling software is often compared to shaving a yak. Fun? Not 
really. If you need a shiny yak, then essential.

Walter

On Dec 9, 2011, at 5:46 AM, Dandy wrote:

> I recently started learning Rails and I'm sorry for my English (I live
> in Moscow) =)
> The Russian Rails Group of developers to me no one could help ...
> 
> 
> Initialy, I installed Ubuntu 11.10, then updated apt-get.
> Next, install the RVM and Ruby.
> 
> Cassandra has installed the following instructions:
> http://blog.wolfgang-vogl.com/?p=140
> 
> How do I link my application on Rails 3 and Cassandra?
> 
> Thank you all!
> 
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