I downloaded "doxygen-1.8.20.linux.bin.tar.gz" here:""
How to install it on Ubuntu 20.04?
21 Answer
This software is already packaged in the Ubuntu 20.04 LTS repository with modern and actual 1.8.17 version.
Simply open terminal and run
sudo apt-add-repository universe
sudo apt-get update
sudo apt-get install doxygenthen use it as it was planned.
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