postinst is in language-pack-gnome-yo-base 1:14.04+20140410.
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 | #!/bin/sh -e
if [ "$1" = "configure" ]; then
/usr/share/locales/install-language-pack "yo" "gnome" "$2" || true
fi
exit 0
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