I had this same problem. I didn't need to use 'install_unix_legacy' or remove any libraries. This is how I fixed it:
Ensure that you have permission to read and execute in the folder you are running ./install from, because the installation program needs to stat files in that folder structure; /home/[user]/MatlabR2020b_Linux_Install/bin/glnxa64/cef_locales/ to be specific, among others.
$ chmod 755 -R /home/[user]/MatlabR2020b_Linux_Install/
$ sudo ~/MatlabR2020b_Linux_Install/install