I configured my Debian repositories to allow "contrib" and "non-free"

wogh8615@raspberrypi:~ $ sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
wogh8615@raspberrypi:~ $ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
Executing: /tmp/apt-key-gpghome.Hhap5baC89/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
gpg: key F42ED6FBAB17C654: public key "Open Robotics <info@osrfoundation.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1

and key imported

but when install ros-noetic-desktop-full unable to locte package how to solve this problems?

this is error message

sudo apt install ros-noetic-desktop-full
패키지 목록을 읽는 중입니다... 완료 -> pacakage succesfull
의존성 트리를 만드는 중입니다 making tree      
상태 정보를 읽는 중입니다... 완료 reading succersfull
E: ros-noetic-desktop-full 패키지를 찾을 수 없습니다 >> unable to locte package ros-noetic-desktop-full