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It simply means that there are some packages which are not installed.

One way is to install packages manually deeper and deeper. Let say, don't install ros-noetic-desktop-full first but install ros-noetic-visualization-tutorials first, then ros-noetic-ros-tutorials, then ros-noetic-urdf-tutorial etc.

If you cannot install these, the problem might be about setting the keys. Have you computed this: sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654 ? and then sudo apt update.

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