libblas.so.3 software package provides virtual package provided by libopenblas-base, libblas3, libatlas3-base, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libblas.so.3
libblas.so.3 is installed in your system.
Make ensure the libblas.so.3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libblas.so.3*
You will get with libblas.so.3 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Virtual packages |
| Package | libblas.so.3 |
| Version | |
| Description | virtual package provided by libopenblas-base, libblas3, libatlas3-base |
| Sub Section | virtual |