[Bug 1627564] Re: Debconf crash due to assertion failure in ensure_surface_for_gicon [gtkiconhelper.c:493] (when png loader is missing/during upgrades)

[Balint Reczey]

This is indeed a complex problem and it is hard to do anything
reasonable about a missing GTK frontend when debconf is not initiated
from the terminal.

OTOH I think there is an easy fix for GTK+ to always include an "image-
missing" icon at compile time, but apparently I'm not the first one
coming up with this idea, but something is still broken:

gtk/gtkiconhelper.c:494


  if (destination == NULL)
    {
      GError *error = NULL;
      destination = gtk_icon_theme_load_icon (icon_theme,
                                              "image-missing",
                                              width,
                                              flags | GTK_ICON_LOOKUP_USE_BUILTIN | GTK_ICON_LOOKUP_GENERIC_FALLBACK,
                                              &error);
      /* We include this image as resource, so we always have it available or
       * the icontheme code is broken */
      g_assert_no_error (error);
      g_assert (destination);
      symbolic = FALSE;
    }

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https://bugs.launchpad.net/bugs/1627564

Title:
  Debconf crash due to assertion failure in ensure_surface_for_gicon
  [gtkiconhelper.c:493] (when png loader is missing/during upgrades)

Status in debconf package in Ubuntu:
  Confirmed
Status in gtk+3.0 package in Ubuntu:
  New
Status in debconf source package in Focal:
  Confirmed
Status in gtk+3.0 source package in Focal:
  New

Bug description:
  https://errors.ubuntu.com/problem/2b11576fed59ad23c640bc85a266cc82ec30a689
  https://errors.ubuntu.com/problem/9d612b3f25168e76adb91fa4eedc301ffa632383

  ---

  bubble opened up indicating there was a failure during the latest
  update.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.10
  Package: lightdm-gtk-greeter 2.0.1-2ubuntu4
  ProcVersionSignature: Ubuntu 4.8.0-16.17-generic 4.8.0-rc7
  Uname: Linux 4.4.0-9136-generic i686
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: i386
  Date: Sun Sep 25 20:37:06 2016
  ExecutablePath: /usr/sbin/lightdm-gtk-greeter
  InstallationDate: Installed on 2016-08-04 (52 days ago)
  InstallationMedia: Lubuntu 16.10 "Yakkety Yak" - Alpha i386 (20160727)
  ProcCmdline: /usr/sbin/lightdm-gtk-greeter
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/false
  Signal: 6
  SourcePackage: lightdm-gtk-greeter
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  modified.conffile..etc.lightdm.lightdm-gtk-greeter.conf:
   [greeter]
   theme-name = Lubuntu-dark-panel
  mtime.conffile..etc.lightdm.lightdm-gtk-greeter.conf: 2016-08-14T22:33:57.293011

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