Public bug reported:

marco@ubuntu:~$ lsb_release -rd
No LSB modules are available.
Description:    Ubuntu 24.04.1 LTS
Release:        24.04

marco@ubuntu:~$ simple-scan -v
simple-scan 46.0

marco@ubuntu:~$ apt-cache policy simple-scan
simple-scan:
  Installed: 46.0-0ubuntu2
  Candidate: 46.0-0ubuntu2
  Version table:
 *** 46.0-0ubuntu2 500
        500 http://it.archive.ubuntu.com/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status

When I run the application I only get a white/blank screen. 
Running the application from terminal in debug mode I get:
marco@ubuntu:~$ simple-scan -d
[+0.00s] DEBUG: simple-scan.vala:2016: Starting simple-scan 46.0, PID=129001
[+0.42s] DEBUG: Using cross-namespace EXTERNAL authentication (this will 
deadlock if server is GDBus < 2.73.3)
[+0.42s] CRITICAL: g_application_set_application_id: assertion 'application_id 
== NULL || g_application_id_is_valid (application_id)' failed
[+0.42s] CRITICAL: g_variant_new_string: assertion 'string != NULL' failed
[+0.45s] DEBUG: _g_io_module_get_default: Found default implementation gvfs 
(GDaemonVfs) for ‘gio-vfs’
[+0.47s] DEBUG: Portal doesn't provide settings: 
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 
“org.freedesktop.portal.Settings” on object at path 
/org/freedesktop/portal/desktop
[+0.47s] DEBUG: Portal doesn't provide settings: 
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 
“org.freedesktop.portal.Settings” on object at path 
/org/freedesktop/portal/desktop
[+0.47s] DEBUG: Portal doesn't provide settings: 
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 
“org.freedesktop.portal.Settings” on object at path 
/org/freedesktop/portal/desktop
[+0.47s] DEBUG: _g_io_module_get_default: Found default implementation dconf 
(DConfSettingsBackend) for ‘gsettings-backend’
[+0.47s] DEBUG: Portal doesn't provide settings: 
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 
“org.freedesktop.portal.Settings” on object at path 
/org/freedesktop/portal/desktop
[+0.49s] DEBUG: Using style /org/gnome/Adwaita/styles/defaults-light.css
[+0.54s] DEBUG: app-window.vala:1436: Loading state from 
/home/marco/.config/simple-scan/state
[+0.54s] DEBUG: app-window.vala:1415: Restoring window to 1865x858 pixels
[+0.57s] DEBUG: scanner.vala:1619: sane_init () -> SANE_STATUS_GOOD
[+0.57s] DEBUG: scanner.vala:1625: SANE version 1.2.1
[+0.57s] DEBUG: scanner.vala:1686: Requesting redetection of scan devices
[+0.57s] DEBUG: scanner.vala:863: Processing request
[+0.72s] DEBUG: app-window.vala:1512: Saving state to 
/home/marco/.config/simple-scan/state
[+6.08s] DEBUG: scanner.vala:348: sane_get_devices () -> SANE_STATUS_GOOD
[+6.08s] DEBUG: scanner.vala:374: Device: 
name="hpaio:/net/Deskjet_2540_series?ip=192.168.0.12" vendor="Hewlett-Packard" 
model="Deskjet_2540_series" type="all-in-one"
[+6.19s] DEBUG: app-window.vala:1512: Saving state to 
/home/marco/.config/simple-scan/state

The result is the same white window

** Affects: simple-scan (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: simple-scan

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https://bugs.launchpad.net/bugs/2079045

Title:
  simple-scan does not load

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