Debian Buster LTSP Gnome login hangs

Hi,

We have LTSP (Debian Buster) installed and connect our clients as FAT 
client.

We have Xfce and Gnome installed on the server.
Clients can login but than the login hangs.

We tried all Gnome Sessions (Gnome, Gnome Classic and Gnome on Xorg)

But clients who use Xfce Session have no problem to login.

Is there some to know if you want to use Gnome in Debian Buster.

With Debian Stretch Gnome was working without issues.

Many thanks for the help!!

$ ltsp-info
server information:
No LSB modules are available.
Distributor ID:    Debian
Description:    Debian GNU/Linux 10 (buster)
Release:    10
Codename:    buster

server packages:
ii ldm-server 2:2.18.06-1
un ltsp-docs <none>
ii ltsp-server 5.18.12-3
ii ltsp-server-standalone 5.18.12-3
un ltsp-utils <none>
ii ltspfs 1.5-2

packages in chroot: /opt/ltsp/buster
ii ldm 2:2.18.06-1
ii ldm-themes 18.02.1
ii ltsp-client 5.18.12-3
ii ltsp-client-core 5.18.12-3
ii ltspfsd 1.5-2
ii ltspfsd-core 1.5-2

found: /opt/ltsp/buster/etc/lts.conf
found: /var/lib/tftpboot/ltsp/buster/lts.conf
found: /srv/tftp/ltsp/buster/lts.conf



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