After upgrading from Mythbuntu 11.04 to 12.03 cron does not appear to be working. I have scripts in /etc/cron.daily and /etc/cron.weekly that aren't running. I modified /etc/crontab from
25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
05 4 * * * root run-parts --report /etc/cron.daily
to eliminate anacron as the issue (though I didn't restart cron if that makes a difference). If I run it manually via
sudo run-parts --report /etc/cron.daily
everything in that directory runs fine.