In cron daily/ update I found this script. I have put # in front of the 2nd line on this script. I haven't a clue about cron and really need help with this please
#!/bin/sh
set -e
[ -x /usr/lib/update-notifier/package-data-downloader ] || exit 0
# Try to rerun any package data downloads that failed at package install time.
#/usr/lib/update-notifier/package-data-downloader