Invalid MEX-file error about GLIBCXX_3.4.26

I'm trying to run a scenario in Matlab with the Truck Platooning script. I have Ubuntu 20.04. Whenever I run the program, I have the following error shown below. Is there anything that I'm missing? I have the latest version of GLIBCXX_3.4.26 and all the libraries are pointing where they should.

[Walter Roberson]

https://askubuntu.com/questions/1166292/version-glibcxx-3-4-26-not-found-even-though-libstdc-so-6-recent-enough

I see other hints that gcc-8 might be enough.