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ROS Electric is not released for Ubuntu 12.04. So I guess that an upgrade will remove your Electric installation. If not, it will be broken for sure and you'll have to uninstall it from hand.

We didn't have too many issues. We had some minor issues with TF datatypes since tf::Vector3 and friends are different from the corresponding bullet data types now, i.e. tf data types and bullet data types cannot be mixed anymore. The fix was not much more than a simple search-and-replace in all files that threw compilation errors. All other problems we had were caused by the newer PCL version. I'd say if you don't heavily use PCL, the upgrade shouldn't break too much.

I'd say it depends. If you still need Electric, I would wait with the upgrade. Otherwise, I would do it.