postinst is in xscreensaver-gl 5.36-1ubuntu1.
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
set -e
if [ -L /etc/X11/app-defaults/XScreenSaver ]; then
if [ "$(readlink /etc/X11/app-defaults/XScreenSaver)" = "XScreenSaver-nogl" ]; then
rm /etc/X11/app-defaults/XScreenSaver
fi
fi
cd /etc/X11/app-defaults
if [ ! -e XScreenSaver ]; then
if [ -f XScreenSaver-gl ]; then
ln -sf XScreenSaver-gl XScreenSaver
else
ln -sf XScreenSaver-nogl XScreenSaver
fi
fi
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