I am new to Linux, coming from a M$ and IBM world. I have multiple users on a Debian Sarge box that need to share files. When a new file is created or added to the shared directory I want the other user to be able to access the file for read and write. I tried to use setfacl at the directory level but it gets an "Operation not supported" error.

I do not want the owning user to have to change permissions for each new file. I want the system to just allow user1 and user2 to both access the files when they logon.

Does anyone have a suggestion on the fix for this. I am running Kernel=Linux 2.6.12-1-686 and GNOME desktops for both users. KDE is also installed on the machine.

StPierRC
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Just found the answer:
1. Create directory to be shared.
Applications/File Browser

2. Create a sharedgroup and add the users to it.
Applications/System Tools/Users and Groups
Enter the Root password

3. Change the permissions of the directory to "File group=sharedgroup" and "Special Flags" check "Set group Id".
From Nautilus (File Browser) right click the directory and
select permissions.
The "Set group Id" flag makes all new files owned by the group. So there is no need to change each file as it is created.

Create a group to which all the users can belong, add each user to that (new) group, change the group ownership of the files to the (new) group, and change the file(s) group permissions to rwx.

Remember: In *nix systems, a user can be a member of multiple groups, so adding them to the (new) group will not change any of their other group permissions or memberships.

Thanks PTrenholme, your answer was faster that my correction of my post.

The difference in our methods is that by setting the group id on the directory, only the existing files need to have the group changed. Your way was what I was doing and the new files could only be accessed for writing by the owner.