prerm is in libegl1-mesa 11.2.0-1ubuntu2.
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 16 17 18 19 20 | #!/bin/sh
set -e
THIS_PACKAGE=libegl1-mesa
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_egl_conf /usr/lib/x86_64-linux-gnu/mesa-egl/ld.so.conf
# explicit ldconfig due to alternatives
ldconfig
esac
exit 0
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