LTSP local devices - auto mounting with user's ownership

Hello,

I'm running ubuntu 8.04 ltsp server. LTSP clients has cdrom, floppy... . USB Flash storage, cdrom.. is mounted automatically when connected, but there is very big problem. Files in /media/user/ (e.g. /media/user1/floppy0) has ownership root:usergroup. I have a lot of users with the same primary group. I have to change ownership for automounting to username:root. How to change it?