I have set up an NFS server on Fedora 13, and I am connecting to it with Fedora 13 and Ubuntu 10.
On both clients the command
mount nfs-server:/shares /mnt/share
works fine. On Fedora I can get into the directory with Nautilus and have read/write permissions as specified in /etc/exports on the server, but on Ubuntu I can only get into it from a sudo'd command line.
The ownership of the file on Fedora is "nobody" and on Ubuntu it's "user #500", with only people in the "500" group having access to it.
Obviously the permissions can't be changed on the client, but with the Fedora box being able to read/write to it with no problems I'm not sure what else I can do on the server to let normal users on the Ubuntu box read it.
If anyone has experience with this or knows where to look for solutions, I would appreciate your advice.