release upgrade not possible

[Ben Speh]

ubuntu-bug ubuntu-release-upgrader-core
Gtk-Message: 14:23:15.109: Failed to load module "canberra-gtk-module"
ben_speh@XPS:~$ update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/gimp/2.0/help /usr/share/gimp/2.0/help none bind,ro 0 0): cannot open directory "/var/lib": permission denied
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/xubuntu-docs /usr/share/xubuntu-docs none bind,ro 0 0): cannot open directory "/var/lib": permission denied
Gtk-Message: 14:23:51.677: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.
[10294, Main Thread] WARNING: GTK+ module /snap/firefox/3416/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:187

(firefox:10294): Gtk-WARNING **: 14:23:51.727: GTK+ module /snap/firefox/3416/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 14:23:51.727: Failed to load module "canberra-gtk-module"
[10294, Main Thread] WARNING: GTK+ module /snap/firefox/3416/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:187

(firefox:10294): Gtk-WARNING **: 14:23:51.728: GTK+ module /snap/firefox/3416/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 14:23:51.728: Failed to load module "canberra-gtk-module"
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
[Parent 10294, Main Thread] WARNING: Failed to call GetIdletime(): GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.113" (uid=1000 pid=10294 comm="/snap/firefox/3416/usr/lib/firefox/firefox https:/" label="snap.firefox.firefox (enforce)") interface="org.gnome.Mutter.IdleMonitor" member="GetIdletime" error name="(unset)" requested_reply="0" destination=":1.51" (uid=1000 pid=3600 comm="/usr/bin/gnome-shell" label="unconfined")
: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:187

** (firefox:10294): WARNING **: 14:23:53.019: Failed to call GetIdletime(): GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.113" (uid=1000 pid=10294 comm="/snap/firefox/3416/usr/lib/firefox/firefox https:/" label="snap.firefox.firefox (enforce)") interface="org.gnome.Mutter.IdleMonitor" member="GetIdletime" error name="(unset)" requested_reply="0" destination=":1.51" (uid=1000 pid=3600 comm="/usr/bin/gnome-shell" label="unconfined")

[Parent 10294, Main Thread] WARNING: Failed to create DBus proxy for org.freedesktop.UPower: Operation was cancelled
: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:187

** (firefox:10294): WARNING **: 14:28:11.502: Failed to create DBus proxy for org.freedesktop.UPower: Operation was cancelled

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: ubuntu-release-upgrader-core 1:23.04.7
ProcVersionSignature: Ubuntu 6.2.0-37.38-generic 6.2.16
Uname: Linux 6.2.0-37-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.26.1-0ubuntu2.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 23 14:23:15 2023
InstallationDate: Installed on 2021-06-24 (881 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to lunar on 2023-11-23 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2023-11-22T23:32:29.844662