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Hi,
You can have different distributions installed and make them work.
It depends on the setup.bash which your .bashrc calls
In the link below, in section 1.5 Environment setup, you can find instructions on how you can have multiple distributions ans set them up for use.
http://www.ros.org/wiki/fuerte/Installation/Ubuntu
Basically whenever a new terminal pops up, .basrc file is called. So if you source the setup of electric or fuerte in .bashrc file, the corresponding distribution is used.