I tried to install Code::Blocks by following this answer, but I cannot install the application:
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The question you link to points to a PPA that hasn't been updated in four years. This would never work on your system. As it stands, there is no PPA to install Code::Blocks in Ubuntu 20.04 at this time. There is one that supports up to 19.10, but it has not been updated in almost a year.
If you would like to use this application, the simplest and safest way to do so would be to download the binary from the Code::Blocks site (you'll probably want the codeblocks_20.03_amd64_stable.tar.xz
file), expand it, then install the application manually.
Hope this helps.