> OTOH I think there is an easy fix for GTK+ to always include an "image-missing" icon at compile time
I'm sorry, it's not that easy. A PNG icon is indeed included, and it gets found properly (also from the actual icon theme; that is a dependency of GTK). The problem is the ability to load PNGs *at all* is not available sometimes during the middle of dist-upgrades. I think extending that test program in Debconf (referred to in the IRC log above) to do a bit more work - trying to load an icon - might make the fallback trigger in this case too. e.g: my $window = Gtk3::Window->new('toplevel'); my $icontheme = Gtk3::IconTheme::get_default; my $icon = $icontheme->load_icon('image-missing', 32, []); If you manually remove '/usr/lib/*/gdk-pixbuf-2.0/2.10.0/loaders.cache' (suggest doing this in a VM) then you can reproduce this by extracting the program out of Debconf. ** Changed in: gtk+3.0 (Ubuntu) Status: New => Invalid ** Changed in: gtk+3.0 (Ubuntu Focal) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debconf/+bug/1627564/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs