I've created a chroot system in my Ubuntu using schroot and debrootstrap, based on minimal ubuntu. However whenever I can't seem to add a new user into this chroot environment. Here is what happens.

1. I enter schroot as root and add a new user.(Tried both adduser and useradd commands)
2. The username lists up in /etc/passwd file and I can 'su' into the new user. So far so good.
3. When I log out of schroot, and re-enter schroot, the user I created has vanished!! There is no mention of that user in /etc/passwd either.

How do I make the new user permanent?