After installing ccminer on Ubuntu, was receiving the subject error.
error while loading shared libraries: libcudart.so.9.1: cannot open shared object file: No such file or directory
Thanks to the folks here I was able to adapt their solution to the current version:
export LD_LIBRARY_PATH=/usr/local/cuda-9.1/lib64:$LD_LIBRARY_PATH
export PATH=/usr/local/cuda-9.1/bin:$PATH
then it works as it should.