There should be a mention of how to follow the instructions using apt install. One non-obvious change to the current non-apt install way is running export CYCLONEDDS_URI=file:///opt/ros/humble/share/fogros2/configs/cyclonedds.ubuntu.2204.xml for Ubuntu 22.04 (or change it to ubuntu.2004.xml for Ubuntu 20.04).
There should be a mention of how to follow the instructions using apt install. One non-obvious change to the current non-apt install way is running
export CYCLONEDDS_URI=file:///opt/ros/humble/share/fogros2/configs/cyclonedds.ubuntu.2204.xmlfor Ubuntu 22.04 (or change it to ubuntu.2004.xml for Ubuntu 20.04).