ImportError: libffi.so.7: cannot open shared object file: No such file or directory code example

Example 1: libcuda.so.1: cannot open shared object file: No such file or directory

# See where the link is pointing.  
ls  /usr/lib/x86_64-linux-gnu/libcuda.so.1 -la
# My result:
# lrwxrwxrwx 1 root root 19 Feb 22 20:40 \
# /usr/lib/x86_64-linux-gnu/libcuda.so.1 -> ./libcuda.so.375.39

# Make sure it is pointing to the right version. 
# Compare it with the installed NVIDIA driver.
nvidia-smi

# Replace libcuda.so.1 with a link to the correct version
cd /usr/lib/x86_64-linux-gnu
sudo ln -f -s libcuda.so.<yournvidia.version> libcuda.so.1

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/