postinst is in alsa-utils 1.0.25-1ubuntu5.
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 | #!/bin/sh
set -e
dpkg-maintscript-helper rm_conffile /etc/init/alsa-mixer-save.conf \
1.0.23-2ubuntu3.4 -- "$@"
case "$1" in
configure)
# Rename /etc/modprobe.d/sound
S="/etc/modprobe.d/sound"
if [ -f "$S" ]
then mv "$S" "$S.conf"
fi
;;
abort-upgrade|abort-remove|abort-deconfigure)
# Nothing to do because we didn't take any action in the prerm
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
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