Just installed Leap 15.

When going to the cups admin page (http://localhost:631/admin) I get the following message:
"Enter your username and password or the root username and password to access this page. If you are using Kerberos authentication, make sure you have a valid Kerberos ticket."

There is no login prompt, although I expect a login prompt (for root + passwd).

In /var/log/cups/error_log, there are the following lines:
Code:
W [04/Aug/2018:10:14:28 +0200] CreateProfile failed: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
W [04/Aug/2018:10:14:28 +0200] CreateProfile failed: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
W [04/Aug/2018:10:14:28 +0200] CreateDevice failed: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
E [04/Aug/2018:10:14:30 +0200] [CGI] cups-brf must be called as root
E [04/Aug/2018:10:14:30 +0200] [cups-deviced] PID 1215 (cups-brf) stopped with status 1!
E [04/Aug/2018:10:14:30 +0200] [cups-deviced] PID 1221 (gutenprint52+usb) stopped with status 1!

cups seems to be running as user 'lp':
Code:
# ps auxwww | grep cups
root       986  0.0  0.1  91796  8488 ?        Ss   10:14   0:00 /usr/sbin/cupsd -l
lp        1167  0.0  0.0  84092  5780 ?        S    10:14   0:00 /usr/lib/cups/notifier/dbus dbus://
Does anyone have a suggestion to make cups provide a prompt with credentials when visiting the printer pages...???