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Just as gvdhoorn said, you can't follow the official tutorial to have ROS on ubuntu jammy. If you are a beginner just trying ROS, I would absolutely recommend to go for ROS2, which have all the newest stuff and will be supported for longer (if you don't have a robot that specifically need ROS1).

However, if you are sure you want ROS1, you can build it from source and it can work on this version of ubuntu. It takes a bit of time but a friend of mine made a guide on how to do it, the link is just below. So you have two options :

1. Install ROS2 easily with a debian package (the latest version just came out as I'm writing this, you can check the official Iron installation guide)
2. Install ROS1 from source, following this guide should make things a lot easier (but it's still quite time consuming) : Guide to install ROS Noetic on ubuntu 22.04