postinst is in lsb-core 9.20170808ubuntu1.
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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | #!/bin/sh
set -e
setup_ldso_symlink () {
    ARCH=$DPKG_MAINTSCRIPT_ARCH
    if [ -z "$ARCH" ]; then
        ARCH=$(dpkg --print-architecture)
    fi
    case "$ARCH" in
        s390|ppc64|sparc|sparc64|alpha|hppa|m68k|mipsel)
            ln -sf ld.so.1 /lib/ld-lsb-$ARCH.so.1
            ln -sf ld.so.1 /lib/ld-lsb-$ARCH.so.2
            ln -sf ld.so.1 /lib/ld-lsb-$ARCH.so.3
            ;;
        powerpc)
            ln -sf ld.so.1 /lib/ld-lsb-ppc32.so.1
            ln -sf ld.so.1 /lib/ld-lsb-ppc32.so.2
            ln -sf ld.so.1 /lib/ld-lsb-ppc32.so.3
            ;;
        i386)
            ln -sf ld-linux.so.2 /lib/ld-lsb.so.1
            ln -sf ld-linux.so.2 /lib/ld-lsb.so.2
            ln -sf ld-linux.so.2 /lib/ld-lsb.so.3
            ;;
        amd64)
            ln -sf ld-linux.so.2 /lib/ld-lsb.so.1
            ln -sf ld-linux.so.2 /lib/ld-lsb.so.2
            ln -sf ld-linux.so.2 /lib/ld-lsb.so.3
            ln -sf ld-linux-x86-64.so.2 /lib64/ld-lsb-x86-64.so.2
            ln -sf ld-linux-x86-64.so.2 /lib64/ld-lsb-x86-64.so.3
            ;;
        ia64)
            ln -sf ld-linux-ia64.so.2 /lib/ld-lsb-ia64.so.1
            ln -sf ld-linux-ia64.so.2 /lib/ld-lsb-ia64.so.2
            ln -sf ld-linux-ia64.so.2 /lib/ld-lsb-ia64.so.3
            ;;
        *)
            echo "ld-lsb-*.so.1 symlink for $ARCH is unknown!"
            ;;
    esac
}
PATH=/sbin:/usr/sbin:$PATH
export PATH
case "$1" in
    configure)
        if dpkg --compare-versions "$2" lt "3.2+Debian30" ; then
          [ -L /lib/ld-lsb-x86-64.so.2 ] && rm /lib/ld-lsb-x86-64.so.2 || true
          [ -L /lib/ld-lsb-x86-64.so.3 ] && rm /lib/ld-lsb-x86-64.so.3 || true
        fi
        setup_ldso_symlink
        ;;
    abort-upgrade|abort-remove|abort-deconfigure)
        ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
# Automatically added by dh_python3:
if which py3compile >/dev/null 2>&1; then
	py3compile -p lsb-core /usr/lib/lsb -V 3.4-
fi
# End automatically added section
 |