[Rails] Can not fix the 'can not find javascript runtime' issue

Hi all,

I am using unbuntu 11.10 with ruby 1.9.3.

I installed ruby 1.9.3 via source code and installed rails 3.2x with the gem command 'sudo gem install rails'

After new a project and run 'rails server', an error occured, it was 'Can not find javascript runtime'.

Then I searched google and try to fix this problem by installing 'therubyracer' gem.

But when I type 'rails server' the problem still orrcued. 

Would you kindly tell me how can I fix this issue?

Thank you. 

Eason

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