libruby-2.7.so.2.7: cannot open shared object file: No such file or directory code example

Example 1: Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory

sudo apt-get install libatlas-base-dev

Example 2: libcublas.so.9.0: cannot open shared object file: No such file or directory

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/cuda-9.0/lib64/