i am running ubuntu 12.04
what i have done (in my useraccount) is:
crontab -e
insert the following line
2 * * * * /home/richi/tmp/my_id

the script is owned by me and is executable

the file in /var/spool/crontabs was created
ls -l /var/spool/cron/crontabs
-rw------- 1 richi crontab 1124 Nov 16 17:12 richi

but the result is that the script is running only every hour (looks like cron.hourly - but this directory is empty)

i also tried /etc/cron.allowd -> no change - cron is running only every hour.
whats going on ?