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How to install ROS2 Jazzy Desktop on Ubuntu 24.04 

sudo apt install software-properties-common
sudo add-apt-repository universe
sudo apt update && sudo apt install curl -y
sudo curl -sSL https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -o /usr/share/keyrings/ros-archive-keyring.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/ros-archive-keyring.gpg] http://packages.ros.org/ros2/ubuntu $(. /etc/os-release && echo $UBUNTU_CODENAME) main" | sudo tee /etc/apt/sources.list.d/ros2.list > /dev/null
sudo apt update
sudo apt -y install ros-jazzy-desktop

After that, you can activate ROS2 using

source /opt/ros/jazzy/setup.bash

You can also add a shortcut for activating ROS using

echo "alias startros='source /opt/ros/jazzy/setup.bash'" >> ~/.bashrc

or for zsh:

echo "alias startros='source /opt/ros/jazzy/setup.bash'" >> ~/.zshrc

Once you have either restarted your shell, or logged back and logged back in, you can activate ROS2 by typing startros:

startros