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)
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