preinst is in xserver-common-lts-trusty 2:1.15.1-0ubuntu2~precise5.
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 | #!/bin/sh -e
set -e
if [ "$1" != upgrade ]; then
# if dpkg-divert --listpackage /usr/lib/xorg/protocol.txt | grep -q xserver-common-lts-trusty; then
# dpkg-divert --remove --package xserver-common-lts-trusty --rename \
# --divert /usr/lib/xorg/protocol-precise.txt \
# /usr/lib/xorg/protocol.txt
# fi
dpkg-divert --add --package xserver-common-lts-trusty --rename \
--divert /usr/lib/xorg/protocol-precise.txt \
/usr/lib/xorg/protocol.txt
fi
exit 0
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