Can't install ROS package listed on index from either apt or rosdep

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Hi,

I want to download this package called "grpc" for compiling Protobuf messages. However, on my Noetic installation, running sudo apt install ros-noetic-grpc (or even sudo apt list ros-noetic-g*) turns up nothing. Other Noetic packages like e.g.:

ros-noetic-grid-map-ros/focal 1.6.4-1focal.20220512.131357 amd64 ros-noetic-grid-map-rviz-plugin-dbgsym/focal 1.6.4-1focal.20220512.132257 amd64 ros-noetic-grid-map-rviz-plugin/focal 1.6.4-1focal.20220512.132257 amd64 ros-noetic-grid-map-sdf-dbgsym/focal 1.6.4-1focal.20220221.112002 amd64 ros-noetic-grid-map-sdf/focal 1.6.4-1focal.20220221.112002 amd64

are showing up, but not the one I want. I also tried rosdep install grpc to "cannot find all required resources." I'm on an x64 20.04 machine, and my ros-latest.list has deb http://packages.ros.org/ros/ubuntu focal main. Would anyone know why I can't find this package, or if they're able to see it on other machines?