Public bug reported:
Ubuntu release:
Ubuntu 26.04 LTS (Resolute Raccoon), amd64
Kernel: 7.0.0-29-generic
Affected packages:
network-manager-sstp 1.3.2-1build6
network-manager-sstp-gnome 1.3.2-1build6
network-manager 1.54.3-2ubuntu3
gnome-control-center 1:50.3-0ubuntu0.1
libnma-gtk4-0 1.10.6-7
Steps to reproduce:
1. Install sstp-client, network-manager-sstp and network-manager-sstp-gnome
from the official Resolute repositories.
2. Open GNOME Settings -> Network -> VPN -> Add VPN.
3. Select SSTP.
Expected result:
The SSTP editor displays Gateway, User name, Password, CA certificate and PPP
options.
Actual result:
The dialog displays only the generic connection name field. The SSTP-specific
editor content is missing.
The journal logs these messages when the editor is opened:
gnome-control-center: invalid (NULL) pointer instance
gnome-control-center: g_signal_handlers_disconnect_matched: assertion
'G_TYPE_CHECK_INSTANCE (instance)' failed
Root cause:
The GTK4 editor library embeds an invalid property on GtkCenterBox. This can be
verified on the unmodified Ubuntu package with:
plugin=/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-gtk4-vpn-plugin-sstp-editor.so
gresource extract "$plugin"
/org/freedesktop/network-manager-sstp/nm-sstp-dialog.ui
The extracted resource contains:
<object class="GtkCenterBox" id="sstp-vbox">
<property name="orientation">vertical</property>
<property name="spacing">16</property>
GtkCenterBox does not provide a spacing property in GTK4, so GtkBuilder
cannot construct the SSTP editor.
Minimal fix:
Filter obsolete spacing properties only while generating the GTK4 UI. The
original GTK3 UI remains unchanged.
--- a/Makefile.am
+++ b/Makefile.am
@@ -145,7 +145,7 @@
gtk4/%.ui: properties/%.ui
@mkdir -p $(builddir)/gtk4
- gtk4-builder-tool simplify --3to4 $< |grep -v can-default >$@
+ gtk4-builder-tool simplify --3to4 $< | grep -v can-default | grep -v
'name="spacing"' >$@
Verification:
I rebuilt the official Ubuntu source package as 1.3.2-1build6+gtk4fix1 and
installed only network-manager-sstp and network-manager-sstp-gnome. The
generated GtkCenterBox no longer contains the invalid spacing property, all
shared-library dependencies resolve, GNOME Settings starts without the previous
SSTP/GTK4 error, and the existing network connection remains unaffected.
A similar downstream fix has also been used when packaging network-manager-sstp
1.3.2 with GTK4 support:
https://github.com/void-linux/void-packages/pull/59016
** Affects: network-manager-sstp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2163435
Title:
SSTP VPN editor in GNOME Settings shows only connection name due to
invalid GtkCenterBox spacing property
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