CMake 3.20 in Ubuntu 18.04 (reversible way)

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CMake 3.20 in Ubuntu 18.04 (reversible way)

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Last edited Apr 13, 2021

Created on Dec 6, 2021

This example documents a reversible procedure for upgrading CMake to version 3.20 on Ubuntu 18.04 without breaking dependent packages like ROS. It demonstrates building CMake from source using `wget` and `tar`, then packaging it with `checkinstall` to enable later removal. The process verifies the installation with `apt-cache policy` and `cmake --version`, and explains how to revert by switching versions via `apt-get install cmake=VERSION`. The instructions are written as a markdown guide, using shell commands for each step.

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