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[Simon Poirier <2107233@xxxxxxxxxxxxxxxxxx>]

I've done some tracing between evince-previewer and papers-previewer side-by-side.
The apparmor error looks unrelated.

What looks related, however is that although both share almost the same code, papers switched to GTK4.
And gtk4 replaced the cups printing backend by the cpdb (common-print-dialog-backend). From the looks of it, there seems to be a bug in the gtk4 print-backend-cpds module. When receiving a refresh dbus method from gtk (org.openprinting.PrintBackend.doListing), the cpdb-backend-cups dbus service just dies and leaves gtk waiting for a dbus method timeout. 


I haven't gone much further than that. Targetting cups+gtk4


** Also affects: gtk4 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: cpdb-backend-cups (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: papers (Ubuntu)
     Assignee: Simon Poirier (simpoir) => (unassigned)

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https://bugs.launchpad.net/bugs/2107233

Title:
  papers-previewer appamor denials

Status in cpdb-backend-cups package in Ubuntu:
  New
Status in gtk4 package in Ubuntu:
  New
Status in papers package in Ubuntu:
  Confirmed

Bug description:
  Start paper on a PDF, select print > print preview > print: print-preview not responding.
  note the printer works fine if I print a text file or use as scanner
  corrado@corrado-n3-pp-0411:~/Documents$ papers prova.pdf
  libEGL warning: MESA-LOADER: failed to retrieve device information

  MESA-LOADER: failed to retrieve device information
  MESA-LOADER: failed to retrieve device information
  libEGL warning: egl: failed to create dri2 screen
  MESA-LOADER: failed to retrieve device information
  libEGL warning: egl: failed to create dri2 screen

  (papers:176974): Gtk-WARNING **: 08:49:59.939:
  GtkPrintOperation::create-custom-widget not supported with portal

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: papers 48.0-1ubuntu1
  ProcVersionSignature: Ubuntu 6.14.0-15.15-generic 6.14.0
  Uname: Linux 6.14.0-15-generic x86_64
  ApportVersion: 2.32.0-0ubuntu5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 12 08:51:01 2025
  InstallationDate: Installed on 2025-04-11 (1 days ago)
  InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Daily amd64 (20250411)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: papers
  UpgradeStatus: No upgrade log present (probably fresh install)

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