Hi Cheolyong,
Set the path to the MATLAB version that you want to open, from the command line. If you installed MATLAB correctly, you can find it in this path -
cd /usr/local/matlab/R2019b
You can manually run the executable file in the terminal from this directory, or in the command line, type
./matlab
Refer to this answer here for more help - How do I launch MATLAB on Linux?
Hope this helps!