I have set up a classroom with 30 thin clients. I have about 150 users whose accounts have been created using Webmin for convenience.

Each of these users is a member of the student group, which was done so that a restricted specific menu is displayed when a student logs in. This works fine.

I wish to restrict each student to accessing their home folder only, as from what I can see they can access the entire file system should they wish to at present.

Could someone suggest the easiest way to achieve this, either by a change to each account or by virtue that they are all members of the students group.