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Hello, I was working with ROS today and got a prompt from the command line about installing this: apt install python3-rosdep2

it's almost certain that's one of the UpstreamPackages. Those are not compatibly with actual ROS Noetic packages, which is why apt asked you whether you'd be OK with uninstalling all of the packages you show.

See the linked wiki page for more information about them, and see “upstream packages” increasingly becoming a problem for a recent-ish discussion.

Hello, I was working with ROS today and got a prompt from the command line about installing this: apt install python3-rosdep2

it's almost certain that's one of the UpstreamPackages. Those are not compatibly with actual ROS Noetic packages, which is why apt asked you whether you'd be OK with uninstalling all of the packages you show.

See the linked wiki page for more information about them, and see “upstream packages” increasingly becoming a problem for a recent-ish discussion.

Is there any way to revert this?

Just reinstall ros-noetic-desktop-full. apt will probably start complaining / warning that python3-rosdep2 is not compatible, but you don't need that package anyway.