03-21-2019
With so little information given, there isn't much that we can say other than that someone who knows the appropriate password or has the appropriate privileges was logged in at the time the change was made. You say that many things started failing all of a sudden. That is the time at which it happened.
What manager is responsible for the group from which that user was removed? Did that manager ask/authorize that user to be removed from that group? Was that user transferred to a different group? Was that user fired?
Other than that user being unable to run jobs requiring the privileges of that group ID, is anyone other than that user unable to run any code that they need to run? If so, why? I.e., why are other users trying to run code as another user instead of using their own accounts? Why aren't their user IDs in the group if they need to run code that requires privileges to run code that affects projects owned by that group?
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LEARN ABOUT SUSE
lppasswd
lppasswd(1) Apple Inc. lppasswd(1)
NAME
lppasswd - add, change, or delete digest passwords.
SYNOPSIS
lppasswd [ username ]
lppasswd -a [ -g groupname ] username
lppasswd -x username
DESCRIPTION
lppasswd adds, changes, or deletes passwords in the CUPS digest password file, passwd.md5. When run by a normal user, lppasswd will prompt
for the old and new passwords. When run by the super-user, lppasswd can add new accounts (-a username), change existing accounts (user-
name), or delete accounts (-x username) in the digest password file. Digest usernames do not have to match local UNIX usernames.
OPTIONS
lppasswd supports the following options:
-g groupname
Specifies a group other than the default system group.
SECURITY ISSUES
By default, the lppasswd program is not installed to allow ordinary users to change their passwords. To enable this, the lppasswd command
must be made setuid to root with the command:
chmod u+s lppasswd
While every attempt has been made to make lppasswd secure against exploits that could grant super-user privileges to unprivileged users,
paranoid system administrators may wish to use Basic authentication with accounts managed by PAM instead.
SEE ALSO
lp(1), lpr(1),
http://localhost:631/help
COPYRIGHT
Copyright 2007-2009 by Apple Inc.
22 February 2008 CUPS lppasswd(1)