postinst is in libblas3 3.7.1-4ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
set -e
update-alternatives --install /usr/lib/x86_64-linux-gnu/libblas.so.3 \
libblas.so.3-x86_64-linux-gnu /usr/lib/x86_64-linux-gnu/blas/libblas.so.3 10
exit 0
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