CMake 3.21 armhf Debian package is missing from the Kitware APT Repository for Ubuntu Focal Fossa (20.04)
The latest armhf architecture cmake Debian package is version 3.20.5-0kitware1ubuntu20.04.1 while cmake-data is version 3.21.3-0kitware1ubuntu20.04.1 causing the following error unless the 3.20.5 version is explicitly specified:
The following packages have unmet dependencies:
cmake : Depends: cmake-data (= 3.20.5-0kitware1ubuntu20.04.1) but 3.21.3-0kitware1ubuntu20.04.1 is to be installed
E: Unable to correct problems, you have held broken packages.