postinst is in mono-runtime 2.10.8.1-1ubuntu2.
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 14 15 16 17 18 19 | #!/bin/sh -e
update-alternatives \
	--install /usr/bin/cli cli /usr/bin/mono 10 \
	--slave /usr/share/man/man1/cli.1.gz cli.1.gz /usr/share/man/man1/mono.1.gz
if [ configure = "$1" ] && [ -x /usr/sbin/update-binfmts ]; then
	update-binfmts --import cli
fi
if [ configure = "$1" ] && [ -d /usr/share/dotnet/mono/ ] && [ -L /usr/share/dotnet/mono ]; then
	# it's a symlink
	rm /usr/share/dotnet/mono
fi
if [ "$1" = "configure" ]; then
	ldconfig
fi
        
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