[ale] Passwords displaying on multi-user system?

[Todor Fassl]

What do you all make of this report from an end user? The user is a grad 
student who shares an office with several other students.  Right now, 
there are 5 of them logged in, they've all failed to log out when they 
walked away from the machine.

 > I was about to use the machine in my [shared] office just now, and had
 > to click "sign in as another user". In between that and the list of
 > usernames appearing, a black screen with white text on it popped up
 > for half a second tops. I noticed it showed my password in plain text,
 > and presumably some of the other text was other people's passwords.

The system is a fully updated ubuntu bionic system using lightdm for the 
display manager.

-- 
Todd