Bug#972506: gnome-software doesn't download available OS updates

[Roberto De Oliveira]

Package: gnome-software
Version: 3.38.0-2
Severity: important

Dear Maintainer,

I am trying to install available updates using gnome-software but this version doesn't download the OS packages, when I click buttons for upgrade or reboot and 
update I get the message:

not GsPlugin error pk-engine-error-quark:1: GDBus.Error:org.gtk.GDBus.UnmappedGError .Quark._pk_2dengine_2derror_2dquark.Code1: Prepared update not found: 
/var/lib/PackageKit/prepared-update

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.8.0-3-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=es_VE.UTF-8, LC_CTYPE=es_VE.UTF-8 (charmap=UTF-8), LANGUAGE=es_VE:es
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-software depends on:
ii  appstream                                    0.12.11-1
ii  apt-config-icons                             0.12.11-1
ii  dconf-gsettings-backend [gsettings-backend]  0.38.0-1
ii  gnome-software-common                        3.38.0-2
ii  gsettings-desktop-schemas                    3.38.0-2
ii  libappstream-glib8                           0.7.17-1
ii  libatk1.0-0                                  2.36.0-2
ii  libc6                                        2.31-4
ii  libcairo2                                    1.16.0-4
ii  libfwupd2                                    1.4.6-2
ii  libgdk-pixbuf2.0-0                           2.40.0+dfsg-5
ii  libglib2.0-0                                 2.66.1-2
ii  libgspell-1-2                                1.8.4-1
ii  libgtk-3-0                                   3.24.23-2
ii  libgtk3-perl                                 0.037-1
ii  libgudev-1.0-0                               234-1
ii  libjson-glib-1.0-0                           1.6.0-1
ii  libmalcontent-0-0                            0.9.0-2
ii  libpackagekit-glib2-18                       1.1.13-2+b1
ii  libpolkit-gobject-1-0                        0.105-29
ii  libsoup2.4-1                                 2.72.0-2
ii  libxmlb1                                     0.1.15-2
ii  packagekit                                   1.1.13-2+b1
ii  software-properties-gtk                      0.96.20.2-2.1

Versions of packages gnome-software recommends:
ii  fwupd  1.4.6-2

Versions of packages gnome-software suggests:
pn  apt-config-icons-hidpi         <none>
ii  gnome-software-plugin-flatpak  3.38.0-2
ii  gnome-software-plugin-snap     3.38.0-2

-- no debconf information