postrm is in libgtk-3-bin 3.18.9-1ubuntu3.
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 -e
set -e
if [ "$1" = remove ] ; then
dpkg-divert --remove --package libgtk-3-bin --rename \
--divert /usr/sbin/update-icon-caches.gtk2 \
/usr/sbin/update-icon-caches
dpkg-divert --remove --package libgtk-3-bin --rename \
--divert /usr/share/man/man8/update-icon-caches.gtk2.8.gz \
/usr/share/man/man8/update-icon-caches.8.gz
fi
exit 0
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