preinst is in ruby2.0 2.0.0.484-1ubuntu2.
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 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ]; then
update-alternatives --remove gem /usr/bin/gem2.0 || true
update-alternatives --remove ruby /usr/bin/ruby2.0 || true
fi
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