This file is indexed.

/usr/share/ltsp/plugins/ltsp-build-client/Debian/010-distribution-specific is in ltsp-server 5.5.7-1.

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The actual contents of the file can be viewed below.

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case "$MODE" in
    before-install)
        case "$DIST" in
            sid|unstable)
                echo "`eval_gettext "NOTE: disabling security and updates APT sources for sid.  They do not exist."`"
                SECURITY_MIRROR=none
                UPDATES_MIRROR=none
                ;;
        esac
        ;;
esac