postinst is in gnome-shell-common 3.28.1-0ubuntu2.
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 | #!/bin/sh
set -e
if [ "$1" = configure ]; then
update-alternatives --install /usr/share/gnome-shell/theme/gdm3.css \
gdm3.css /usr/share/gnome-shell/theme/ubuntu.css 10
fi
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