Okay, now I can reproduce it again, not having to switch between
systems.

Starting up thunderbird I see:
---------------------------------------------------------------------------
Sep 19 07:18:25 pc098 systemd[2188]: Started 
snap.thunderbird.thunderbird-3e9074b7-82b5-4508-a17d-dc59d0c99171.scope.
░░ Subject: A start job for unit UNIT has finished successfully                 
          
░░ Defined-By: systemd                                                          
                                                                                
                                                                                
         
░░ Support: http://www.ubuntu.com/support                                       
                                            
░░                                                            
░░ A start job for unit UNIT has finished successfully.       
░░                                                            
░░ The job identifier is 1315.                                
Sep 19 07:18:25 pc098 kernel: audit: type=1400 audit(1726723105.260:226): 
apparmor="DENIED" operation="capable" class="cap" 
profile="/usr/lib/snapd/snap-confine" pid=4982 comm="snap-confine" 
capability=12  capname="net_admin"
Sep 19 07:18:25 pc098 kernel: audit: type=1400 audit(1726723105.260:227): 
apparmor="DENIED" operation="capable" class="cap" 
profile="/usr/lib/snapd/snap-confine" pid=4982 comm="snap-confine" 
capability=38  capname="perfmon"
Sep 19 07:18:25 pc098 kernel: audit: type=1400 audit(1726723105.264:228): 
apparmor="DENIED" operation="open" class="file" 
profile="snap-update-ns.thunderbird" name="/proc/5002/maps" pid=5002 comm="5" 
requested_mask="r" denied_mask="r" fsuid=2087 oui
d=0                                                                             
                                            
Sep 19 07:18:25 pc098 thunderbird-bin[4982]: Not loading module "atk-bridge": 
The functionality is provided by GTK natively. Please try to not load it.
Sep 19 07:18:25 pc098 thunderbird_thunderbird.desktop[4982]: [4982, Main 
Thread] WARNING: GTK+ module 
/snap/thunderbird/510/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
Sep 19 07:18:25 pc098 thunderbird_thunderbird.desktop[4982]: GTK+ 2.x symbols 
detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.: 
'glib warning', file 
/build/thunderbird/parts/thunderbird/build/toolkit/xre/nsSigHandlers.cpp:18
7                                                             
Sep 19 07:18:25 pc098 thunderbird-bin[4982]: GTK+ module 
/snap/thunderbird/510/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.
Sep 19 07:18:25 pc098 thunderbird-bin[4982]: Failed to load module 
"canberra-gtk-module"
Sep 19 07:18:25 pc098 thunderbird_thunderbird.desktop[4982]: [4982, Main 
Thread] WARNING: GTK+ module 
/snap/thunderbird/510/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
Sep 19 07:18:25 pc098 thunderbird_thunderbird.desktop[4982]: GTK+ 2.x symbols 
detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.: 
'glib warning', file 
/build/thunderbird/parts/thunderbird/build/toolkit/xre/nsSigHandlers.cpp:18
7                                                             
Sep 19 07:18:25 pc098 thunderbird-bin[4982]: GTK+ module 
/snap/thunderbird/510/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.
Sep 19 07:18:25 pc098 thunderbird-bin[4982]: Failed to load module 
"canberra-gtk-module"
Sep 19 07:18:25 pc098 thunderbird_thunderbird.desktop[4982]: [ImapModuleLoader] 
Using nsImapService.cpp
Sep 19 07:18:25 pc098 thunderbird_thunderbird.desktop[4982]: [GFX1-]: glxtest: 
libpci missing
Sep 19 07:18:26 pc098 dbus-daemon[3915]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/a11y/bus" 
interface="org.freedesktop.DBus.Properties" member="Get" mask="send" 
name="org.a11y.Bus" pid=4982 label="snap.thunderbird.thu
nderbird" peer_pid=4246 peer_label="unconfined"               
Sep 19 07:18:26 pc098 dbus-daemon[1341]: [system] Activating via systemd: 
service name='org.freedesktop.timedate1' 
unit='dbus-org.freedesktop.timedate1.service' requested by ':1.165' (uid=2087 
pid=4982 comm="/snap/thunderbird/510/usr/lib/thunderbird
/thunderb" label="snap.thunderbird.thunderbird (enforce)")    
Sep 19 07:18:26 pc098 systemd[1]: Starting systemd-timedated.service - Time & 
Date Service...
░░ Subject: A start job for unit systemd-timedated.service has begun execution  
      
░░ Defined-By: systemd                                        
░░ Support: http://www.ubuntu.com/support
░░                                                            
░░ A start job for unit systemd-timedated.service has begun execution.
░░                                                                              
                                            
░░ The job identifier is 4072.                                                  
                                                                                
                                                                                
         
Sep 19 07:18:26 pc098 dbus-daemon[1341]: [system] Successfully activated 
service 'org.freedesktop.timedate1'
Sep 19 07:18:26 pc098 systemd[1]: Started systemd-timedated.service - Time & 
Date Service.
░░ Subject: A start job for unit systemd-timedated.service has finished 
successfully
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit systemd-timedated.service has finished successfully.
░░ 
░░ The job identifier is 4072.
Sep 19 07:18:26 pc098 kernel: audit: type=1107 audit(1726723106.582:229): 
pid=1341 uid=103 auid=4294967295 ses=4294967295 subj=unconfined 
msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" 
path="/org/freedesktop/login1" interface="org.freedesktop.DBus.Properties" 
member="GetAll" mask="send" name=":1.11" pid=4982 
label="snap.thunderbird.thunderbird" peer_pid=1386 peer_label="unconfined"
                               exe="/usr/bin/dbus-daemon" sauid=103 hostname=? 
addr=? terminal=?'
Sep 19 07:18:26 pc098 kernel: audit: type=1107 audit(1726723106.582:230): 
pid=1341 uid=103 auid=4294967295 ses=4294967295 subj=unconfined 
msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" 
path="/org/freedesktop/timedate1" interface="org.freedesktop.DBus.Properties" 
member="GetAll" mask="send" name=":1.166" pid=4982 
label="snap.thunderbird.thunderbird" peer_pid=5155 peer_label="unconfined"
                               exe="/usr/bin/dbus-daemon" sauid=103 hostname=? 
addr=? terminal=?'
Sep 19 07:18:26 pc098 kernel: audit: type=1107 audit(1726723106.590:231): 
pid=1341 uid=103 auid=4294967295 ses=4294967295 subj=unconfined 
msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" 
path="/org/freedesktop/timedate1" interface="org.freedesktop.DBus.Properties" 
member="GetAll" mask="send" name=":1.166" pid=4982 
label="snap.thunderbird.thunderbird" peer_pid=5155 peer_label="unconfined"
                               exe="/usr/bin/dbus-daemon" sauid=103 hostname=? 
addr=? terminal=?'
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 7 threads of 4 processes 
of 1 users.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 7 threads of 4 processes 
of 1 users.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 7 threads of 4 processes 
of 1 users.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 7 threads of 4 processes 
of 1 users.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Successfully made thread 5200 of 
process 4982 owned by 'fgiannetta' RT at priority 10.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 8 threads of 5 processes 
of 1 users.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 8 threads of 5 processes 
of 1 users.
Sep 19 07:18:27 pc098 rtkit-daemon[2015]: Supervising 8 threads of 5 processes 
of 1 users.
Sep 19 07:18:28 pc098 dbus-daemon[3915]: [session uid=2087 pid=3915] Activating 
via systemd: service name='ca.desrt.dconf' unit='dconf.service' requested by 
':1.28' (uid=2087 pid=4334 comm="/usr/bin/gnome-shell" label="unconfined")
Sep 19 07:18:28 pc098 systemd[2188]: Starting dconf.service - User preferences 
database...
░░ Subject: A start job for unit UNIT has begun execution
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit UNIT has begun execution.
░░ 
░░ The job identifier is 1319.
Sep 19 07:18:28 pc098 dbus-daemon[3915]: [session uid=2087 pid=3915] 
Successfully activated service 'ca.desrt.dconf'
Sep 19 07:18:28 pc098 systemd[2188]: Started dconf.service - User preferences 
database.
░░ Subject: A start job for unit UNIT has finished successfully
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit UNIT has finished successfully.
░░ 
░░ The job identifier is 1319.
Sep 19 07:18:32 pc098 systemd[1]: systemd-hostnamed.service: Deactivated 
successfully.
░░ Subject: Unit succeeded
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ The unit systemd-hostnamed.service has successfully entered the 'dead' state.
Sep 19 07:18:32 pc098 systemd[1]: systemd-localed.service: Deactivated 
successfully.
░░ Subject: Unit succeeded
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ The unit systemd-localed.service has successfully entered the 'dead' state.
Sep 19 07:18:56 pc098 systemd[1]: systemd-timedated.service: Deactivated 
successfully.
░░ Subject: Unit succeeded
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ The unit systemd-timedated.service has successfully entered the 'dead' state.
:1.109" pid=3767 label="snap.thunderbird.thunderbird" peer_pid=3943 
peer_label="unconfined"
                               exe="/usr/bin/dbus-daemon" sauid=103 hostname=? 
addr=? terminal=?'
---------------------------------------------------------------------------
When opening a new email window, signatures are not shown.
In the configuration the old "/run/user/2087/doc/e967c83e/mysignature.html", 
when opening the file dialog the old path if opened and after selecting the 
file again signatures work.
Rebooting the system, link is still 
"/run/user/2087/doc/e967c83e/mysignature.html", but since the file doesn't 
exist any more (/run/user/... gets cleaned on reboot; iirc) I got no signature 
and have to re-select the signature again. (I got 5 different e-mails and 
signatures, so this is annoying.)

So seems like the recreation of the /run/user/... files doesn't really
work properly.

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https://bugs.launchpad.net/bugs/2079039

Title:
  signature stored on a nfs share not working with the snap

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