select nano by typing 2 and then hitting entersudo crontab -e
add the following lines
change "adminusername" to the username you used when installing ubuntu20 * * * * chown -R adminusername:users /var/hda/files/newsgroups
20 * * * * chmod -R 777 /var/hda/files/newsgroups
once these lines are entered, hit Ctrl+x, then y, then Enter.
That should do the trick, by fixing file ownership and permissions in the SabNZBd+ download directories every 20 minutes.
I'm not sure if running these commands every 20 minutes is a good idea or not, but I rationalized 20 minutes based on the fact that a 2GB bluray rip of an hour-long TV episode takes approximately 20 minutes to download on my system and I'd like to be able to watch some episodes the same night they air.