provide some info about user collaboration and file permissions (while copying)

It's ment to inform the user during install and GPL of course.

I really don't think that the installer is the right place for verbose explanations of how to use Unix. Most people would much prefer to get through the installer as quickly as possible and get on with using the resulting system.

Could we please find some kind of user guide to put this documentation in instead?

Thank you for reassigning the bug.

Yes, the info should really be in the documentation, too.

I have filed this from practice. Many support requests deal with (new, aka ex windows) users that have installed ubuntu not able to easily collaborate with other users on their ubuntu installation.

The explanation screen is almost empty when setting up the initial user account, and the question arises in new users "What,... is this good for?" The info should not prevent people to get though the installer as quickly as possible. But it will set the caucious first time installers right on track, just when they have taken the time to install their system. (They won't read docs on this later on, but complain about not being able to collaborate on ubuntu.)

It might be possible to make this even more brief, if for example group directories will be created with new groups by default.

"ubuntu is linux for humans"
It's not about how to fiddle with unix file permissions, but how to collaborate in an debian/ubuntu setting.

FYI the issue of "users not belonging to users group" is now separated out into Bug #253103
(Please comment if you think that that is a bug that needs fixing, as there is some hesitance.)

The following wiki page now contains more information and ties together related bugs.
 https://wiki.ubuntu.com/MultiUserManagement

I agree with his findings. About the FUSE filesystem Daemon, I have rewritten the procedure on how to get this local share between users to be done easily on http://airkayu.com/node/24 just in case you are still in a maze.

The informational text suggested is and can be updated on https://wiki.ubuntu.com/MultiUserManagement

This kind of information would be perfect for presentation by the installer during the copying phase.