This file is indexed.

postinst is in breeze-cursor-theme 4:5.12.4-0ubuntu1.

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.

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#! /bin/sh
set -e

TARGET=/usr/share/icons/default/index.theme
ICONDIR=/etc/X11/cursors

# breeze_cursors with 102 (DMZ+2) priority
update-alternatives --install $TARGET x-cursor-theme \
    $ICONDIR/breeze_cursors.theme 102

# Breeze_Snow with 41 (Oxygen+1) priority
update-alternatives --install $TARGET x-cursor-theme \
    $ICONDIR/Breeze_Snow.theme 41

case "$1" in
    configure)
        # On upgrade from a version that was badly managing the
        # x-cursor-theme, remove the old ones from the alternatives.
        version="$2"
        if [ -n "$version" ] && \
                dpkg --compare-versions "$version" lt "4:5.4.1-2~"; then
            update-alternatives --remove x-cursor-theme \
                /usr/share/icons/Breeze_Snow/index.theme    || true
            update-alternatives --remove x-cursor-theme \
                /usr/share/icons/breeze_cursors/index.theme || true
        fi
        ;;
esac