Setting up workspace

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First, switching a workspace from fuerte back to electric can always cause errors when compiling / building sources. Be aware of that. It is safer to create separate workspaces for different ROS versions.

Next, I suggest that you use rosws / rosinstall to create and manage your workspaces.

Third, open your .bashrc in some editor, and find any place mentioning ROS_ROOT, ROS_WORKSPACE, or setup.sh.

Delete all those lines. Regarding ROS, there should only be one line in your .bashrc, that reads:

source ~/ros_workspace/setup.sh

Even if it can work, managing the ROS_PACKAGE_PATH yourself almost always leads to bad ROS_PACKAGE_PATH in the long run and confusing errors.