CUPS doesn't start, then requires login for admin task from browser

[whoami]

@ans1 maybe this also helps (based on Debian minimal)

Setup a WLAN / LAN Printer IPP Everywhere™

This how-to guide provides the very fundamental configuration to get a (Brother) IPP network printer working in Qubes OS. What is IPP Everywhere™ (driverless printing) and why should I pick a IPP printer? What printer supports IPP? For the ease of use and to avoid typing errors, I do not put all command in dom0 to benefit from copy & paste some code lines directly to the templateVM and appVM. To keep things minimal and avoid messing up your default templates, we are going to use a …