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If you upgrade from a system that uses /usr/lib/cron/cron.deny instead of /usr/lib/cron/cron.allow, then both files will exist on the system after an Upgrade installation. To continue using /usr/lib/cron/cron.deny, you should remove /usr/lib/cron/cron.allow. (If you are using /usr/lib/cron/cron.allow, you do not need to change.)
Similarly, if you upgrade from a system that uses /usr/lib/cron/at.deny instead of /usr/lib/cron/at.allow, then both files will be present after the upgrade, and you should remove /usr/lib/cron/at.allow. (If you are using /usr/lib/cron/at.allow, you do not need to change.)
Upgrading a system with user crontab(C) entries might produce an error message similar to:
Error: Unable to add custom symlinks report to crontab file
Press <Enter> to ignore this error message and continue; your crontab files will be preserved during the Upgrade installation.