Guys, I am geting the same error message
Starting Dynare (version 4.7-unstable).
Calling Dynare with arguments: none
/home/anton/dynare/matlab/preprocessor64/dynare_m: /usr/local/MATLAB/R2020b/sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.26’ not found (required by /home/anton/dynare/matlab/preprocessor64/dynare_m)
But sudo apt install matlab-support doesn’t fix it, any other suggestions?