prerm is in libgl1-mesa-swx11 8.0.2-0ubuntu3.
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 | #!/bin/sh
set -e
THIS_PACKAGE=libgl1-mesa-swx11
THIS_SCRIPT=prerm
case "$1" in
remove)
# Use alternatives to make it easier to switch between Mesa and 3rd party modules
update-alternatives --remove x86_64-linux-gnu_gl_conf /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf
# explicit ldconfig due to alternatives
ldconfig
esac
exit 0
# vim:set ai et sw=2 ts=2 tw=80:
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