Comment 3 for bug 1349387

Same here (CUPS access.log):

localhost - root [21/Aug/2014:09:57:28 -0300] "GET /admin/conf/cupsd.conf HTTP/1.1" 404 0 - -

Every time I try enter configuration menu.

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty

$ system-config-printer --debug
OpenPrinting: Init ('pt_BR', 'UTF-8') 1 0
+<NewPrinterGUI object at 0x7f1bc40d0fa0 (newprinter+NewPrinterGUI at 0x2961d80)>
Connected as user david
+<PrinterPropertiesDialog object at 0x7f1bc40f4410 (printerproperties+PrinterPropertiesDialog at 0x29a70e0)>
<authconn.Connection instance at 0x7f1bb7eb4638>: Operation += obtendo detalhes da fila
Authentication pass: 1
Authentication: password callback set
Authentication pass: 1
Authentication: password callback set
Authentication pass: 1
Authentication: password callback set
<authconn.Connection instance at 0x7f1bb7eb4638>: Operation ended
+<ppdcache.PPDCache instance at 0x7f1bbc023518>
refresh
Created subscription 425, events=['printer-added', 'printer-deleted', 'printer-state-changed']
Next notifications fetch in 1s
update_jobs
get_notifications
update_jobs
Next notifications fetch in 60s
Connected as user david
Authentication pass: 1
Authentication: password callback set
PolicyKit call to FileGet did not work: dbus.String(u'Not Found')
Authentication pass: 2
Forbidden: False
Authentication: Try as root
Connected as user root
Authentication pass: 3
Forbidden: False
Authentication: giving up
Canceled subscription 425
DESTROY: <PrinterPropertiesDialog object at 0x7f1bc40f4410 (printerproperties+PrinterPropertiesDialog at 0x29a70e0)>
DESTROY: <NewPrinterGUI object at 0x7f1bc40d0fa0 (newprinter+NewPrinterGUI at 0x2961d80)>