This file is indexed.

/usr/share/dbconfig-common/dpkg/preinst is in dbconfig-common 2.0.4ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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###
### what happens in this script:
###
### nothing.  unfortunately we can't reliably be run out of a package's
### preinst script without pre-dependencies, and we don't really need
### to anyway.
###
dbc_go(){
    if [ -f /usr/share/dbconfig-common/dpkg/common ]; then
        . /usr/share/dbconfig-common/dpkg/common
        dbc_logline "W: use of dbc preinst hooks is now unnecesary and deprecated"
    fi
}