postinst is in liblapack3gf 3.5.0-2ubuntu1.
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 11 | #! /bin/sh
set -e
# For the transition liblapack3gf => liblapack3
update-alternatives --remove liblapack.so.3gf /usr/lib/liblapack/liblapack.so.3
exit 0
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