postrm is in alsa-utils 1.0.27.2-1ubuntu2.
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 | #!/bin/sh
set -e
case "$1" in
purge)
# Remove legacy config and state files
rm -f /etc/alsa/0.9/asound.conf /etc/asound.state
# Remove configuration file generated by alsaconf
rm -f /etc/modprobe.d/sound /etc/modutils/sound \
/etc/modprobe.d/sound.conf
# Remove state file generated by alsactl
rm -f /var/lib/alsa/asound.state
;;
esac
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