postinst is in ca-certificates-mono 4.6.2.7+dfsg-1ubuntu1.
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 12 13 | #!/bin/bash
if [ "x$1" == "xconfigure" ] && [ -x /usr/sbin/update-ca-certificates ]; then
if [ ! -f /var/lib/dpkg/triggers/update-ca-certificates ]; then
/usr/sbin/update-ca-certificates
else
/usr/bin/dpkg-trigger update-ca-certificates
fi
fi
exit 0
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