postrm is in udev 175-0ubuntu9.
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 70 71 72 73 | #!/bin/sh -e
# This script can be called in the following ways:
#
# After the package was removed:
#	<postrm> remove
#
# After the package was purged:
#	<postrm> purge
#
# After the package was upgraded:
#	<old-postrm> upgrade <new-version>
# if that fails:
#	<new-postrm> failed-upgrade <old-version>
#
#
# After all of the packages files have been replaced:
#	<postrm> disappear <overwriting-package> <version>
#
#
# If preinst fails during install:
#	<new-postrm> abort-install
#
# If preinst fails during upgrade of removed package:
#	<new-postrm> abort-install <old-version>
#
# If preinst fails during upgrade:
#	<new-postrm> abort-upgrade <old-version>
# Enable udevadm again
enable_udevadm()
{
    rm -f /sbin/udevadm
    dpkg-divert --package fake-udev --rename --divert /sbin/udevadm.upgrade \
    		--remove /sbin/udevadm
}
# Remove configuration and log files
purge_files()
{
    if [ -f /etc/iftab ]; then
	rm -f /etc/iftab || true
    fi
    if [ -f /var/log/udev ]; then
	rm -f /var/log/udev || true
    fi
}
case "$1" in
    remove)
	;;
    purge)
	purge_files
	;;
    upgrade|failed-upgrade|disappear)
	;;
    abort-install|abort-upgrade)
	enable_udevadm
	;;
    *)
	echo "$0 called with unknown argument \`$1'" 1>&2
	exit 1
	;;
esac
exit 0
 |