Public bug reported:
[ Impact ]
Since gnome-shell 50.1-0ubuntu1.2 (resolute-updates), if the GDM logo
(/usr/share/pixmaps/ubuntu-logo-text-dark.svg) cannot be loaded, the login
dialog throws in its constructor and the greeter shows only the background and
top bar. No user list, no password entry — login is impossible.
[ Cause ]
debian/patches/ubuntu/gdm-loginDialog-Load-the-logo-image-synchronously.patch
(LP: #2145786) switches _updateLogoTexture() from load_file_async() to
load_file_sync() and passes the result straight to add_child(). When loading
fails, texture is null:
JS ERROR: Error: Argument child may not be null
_updateLogoTexture@resource:///org/gnome/shell/gdm/loginDialog.js:1086:27
_updateLogo@resource:///org/gnome/shell/gdm/loginDialog.js:1094:14
_init@resource:///org/gnome/shell/gdm/loginDialog.js:679:14
LoginDialog@resource:///org/gnome/shell/gdm/loginDialog.js:537:4
_ensureUnlockDialog@resource:///org/gnome/shell/ui/screenShield.js:453:28
Upstream (load_file_async) is not affected. The same patch on ubuntu/latest
(51.0-2ubuntu2) already wraps this in try/catch + logError(), but the resolute
version (50.1-0ubuntu1.3 / ubuntu/resolute branch) does not.
[ How it happened here ]
After upgrading 24.04 -> 26.04, image loading failed system-wide: gdk-pixbuf
2.44 decodes via glycin, whose loaders are sandboxed with bwrap, and bwrap was
blocked by a leftover third-party AppArmor profile conflicting with
bwrap-userns-restrict. That root cause was local, but before the SRU the
greeter would have shown a dialog without the logo instead of being unusable.
[ Request ]
Backport the try/catch from ubuntu/latest to resolute, so a missing or
unloadable logo degrades to no logo instead of a blank greeter.
Package: gnome-shell 50.1-0ubuntu1.3, Ubuntu 26.04.1
--
Investigated and drafted with the help of Claude (Anthropic's AI assistant,
Claude Opus 5.5); reviewed and submitted by the reporter.
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: regression-update resolute
** Description changed:
[ Impact ]
Since gnome-shell 50.1-0ubuntu1.2 (resolute-updates), if the GDM logo
(/usr/share/pixmaps/ubuntu-logo-text-dark.svg) cannot be loaded, the login
dialog throws in its constructor and the greeter shows only the background and
top bar. No user list, no password entry — login is impossible.
[ Cause ]
debian/patches/ubuntu/gdm-loginDialog-Load-the-logo-image-synchronously.patch
(LP: #2145786) switches _updateLogoTexture() from load_file_async() to
load_file_sync() and passes the result straight to add_child(). When loading
fails, texture is null:
JS ERROR: Error: Argument child may not be null
_updateLogoTexture@resource:///org/gnome/shell/gdm/loginDialog.js:1086:27
_updateLogo@resource:///org/gnome/shell/gdm/loginDialog.js:1094:14
_init@resource:///org/gnome/shell/gdm/loginDialog.js:679:14
LoginDialog@resource:///org/gnome/shell/gdm/loginDialog.js:537:4
_ensureUnlockDialog@resource:///org/gnome/shell/ui/screenShield.js:453:28
Upstream (load_file_async) is not affected. The same patch on ubuntu/latest
(51.0-2ubuntu2) already wraps this in try/catch + logError(), but the resolute
version (50.1-0ubuntu1.3 / ubuntu/resolute branch) does not.
[ How it happened here ]
After upgrading 24.04 -> 26.04, image loading failed system-wide: gdk-pixbuf
2.44 decodes via glycin, whose loaders are sandboxed with bwrap, and bwrap was
blocked by a leftover third-party AppArmor profile conflicting with
bwrap-userns-restrict. That root cause was local, but before the SRU the
greeter would have shown a dialog without the logo instead of being unusable.
[ Request ]
Backport the try/catch from ubuntu/latest to resolute, so a missing or
unloadable logo degrades to no logo instead of a blank greeter.
Package: gnome-shell 50.1-0ubuntu1.3, Ubuntu 26.04.1
+
+ --
+ Investigated and drafted with the help of Claude (Anthropic's AI assistant,
Claude Opus 5.5); reviewed and submitted by the reporter.
--
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https://bugs.launchpad.net/bugs/2169691
Title:
Login screen blank and unusable when the logo fails to load
(regression from LP: #2145786)
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