preinst is in xubuntu-icon-theme 18.04.5.
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
# In 13.10.0 elementary-xfce-darker/actions/16 was a symlink to elementary-xfce/actions/16
case "$1" in
install|upgrade)
if dpkg --compare-versions "$2" lt "13.10.2"; then
[ -h /usr/share/icons/elementary-xfce-darker/actions/16 ] && rm /usr/share/icons/elementary-xfce-darker/actions/16 || true
fi
esac
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