Bug#1119069: gtk4: No GTK apps can see or print to any configured CUPS printers

[Patrick Plenefisch]

Source: gtk4
Version: 4.18.6+ds-2
Severity: important
X-Debbugs-Cc: simonpatp at gmail.com

Dear Maintainer,

I recently upgraded a Debian 12 system to Debian 13, and immediatly after doing 
so, could only print from KDE apps. All GTK apps no longer show any configured
printers, and those that do (Firefox) are unable to print. CLI tools can also 
print and list printers just fine. It's only GTK applications that suffer this 
issue.

I found similar reports from many years ago, but none of those solutions helped
or were already applied.

This affects all user accounts on the machine.

-- System Information:
Debian Release: 13.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.43+deb13-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled