@Aries46 you haven't linked to the exact instrutions that you're following. But if you're following any instructions from wiki.ros.org they are about ROS 1. Furthermore the error messages that you're having are also related to ROS 1 repositories. So whether or not you're following ROS 2 instructions now. Your ongoing error is because you have added the ROS 1 sources incorrectly to your Ubuntu Jammy system. Any new attempt to install ROS 2 will not fix that. You need to back out the changes that you made when installing ROS 1 to get rid of this error message. Aka remove the ROS 1 repo which is trying to load Jammy.