I have installed vixie-cron on my machine and followed the cron guide. But, adding my normal user to the cron group wasn't enough. vixie-cron creates a crontab group too and set the /var/spool/cron/crontabs directory only writable to user in the crontab group. Knowing that the user have to be in the cron group to access /var/spoo/cron. Reproducible: Always Steps to Reproduce: 1.Follow the guide 2.Launch crontab 3. Actual Results: Impossible to edit user crontab Expected Results: The user should be allowed to edit it.
Read the guide again: "If you chose Vixie cron, you'll probably just want to edit /etc/cron.allow" put your user in that file to allow him to use vixie-cron properly.