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Here is the main Fuerte migration page.

In your tags you mention Ubuntu 12.04, Precise. Electric is not supported on that distribution. If you need both, use Ubuntu 10.10, Oneiric, instead.

ROS distributions are packaged so they can coexist on a single system. I find it helpful to keep both the old and new version when upgrading.

• Make sure each shell only sources the setup for a single version.
• Always cleanly recompile all source overlays for the target version. I find it simplest to check out separate copies.