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Your ROS installations won't interfere with each other, if using the precompiled .deb packages or installing from source into different directories. E.g. diamondback will install into /opt/ros/diamondback, whereas electric will install into /opt/ros/e-turtle (or "electric", whatever the actual directory will be). Once you source one "setup.bash" you will run (and compile) in that ROS version only.

So, apt-get dist-upgrade will not upgrade your ROS installation into a new distribution as the package prefixes are different.

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