Created attachment 609624 [details]
screenshot of the login screen after applying the changes above and rebooting

I followed these (
https://help.gnome.org/admin/system-admin-guide/stable/login-banner.html.en )
instructions to create a warning banner in GDM, however it is not displayed.
Other GDM settings (such as disabling the username list) are working perfectly.


j3t@linux-jzs7:~> cat /etc/dconf/profile/gdm
user-db:user
system-db:gdm


j3t@linux-jzs7:~> cat /etc/dconf/db/gdm.d/01-gdm-lockdown

[org/gnome/login-screen]
disable-user-list=true
banner-message-enable=true
banner-message-text='NOTICE TO USERS\nThis is a Federal computer system and is
the property of the United States Government.\nIt is for authorized use only.
Users (authorized or unauthorized) have no\nexplicit or implicit expectation of
privacy.\n\nAny or all uses of this system and all files on this system may
be\nintercepted, monitored, recorded, copied, audited, inspected, and disclosed
to\nauthorized site, Department of Energy, and law enforcement personnel, as
well\nas authorized officials of other agencies, both domestic and foreign. By
using this system,\nthe user consents to such interception, monitoring,
recording, copying, auditing, inspection,\nand disclosure at the discretionof
authorized site or Department of Energy personnel.\nUnauthorized or improper
use of this system may result in administrative\ndisciplinary action and civil
and criminal penalties.\n\nBy continuing to use this system you indicate your
awareness of and consent to these\n terms and conditions of use. LOG OFF
IMMEDIATELY if you do not agree to the conditions\nstated in this warning.'


j3t@linux-jzs7:~> sudo /usr/bin/dconf update
root's password: