[Pkg-ltsp-devel] Bug#881050: ltsp-server: After boot only a black screen

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Package: ltsp-server
Version: 5.5.9-2
Severity: important

Dear Maintainer,
We use LTSP with Fat Clients with NBD
Most of the clients need to boot several times before they get the Login Page.
They always get a black screen. After a few reboots the boot process get through.
This is very annoying for our users.
After login averything works fine.

Any one an idea in wich direction we have to look?

No error messages found


-- Package-specific info:
chroot information: /opt/ltsp/stretch

-- System Information:
Debian Release: 9.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ltsp-server depends on:
ii  debconf [debconf-2.0]  1.5.61
ii  debconf-utils          1.5.61
ii  debootstrap            1.0.89
ii  gettext-base           0.19.8.1-2
ii  iproute2               4.9.0-1
ii  lsb-release            9.20161125
ii  openssh-client         1:7.4p1-10+deb9u1
ii  python                 2.7.13-2
ii  tcpd                   7.6.q-26

Versions of packages ltsp-server recommends:
ii  dnsmasq                           2.76-5+deb9u1
ii  gnupg                             2.1.18-8~deb9u1
ii  nbd-server                        1:3.15.2-3
ii  openbsd-inetd [inet-superserver]  0.20160825-2
ii  openssh-server                    1:7.4p1-10+deb9u1
ii  squashfs-tools                    1:4.3-3+deb9u1
ii  tftpd-hpa                         5.2+20150808-1+b1

Versions of packages ltsp-server suggests:
pn  audiooss                                  <none>
ii  dnsmasq                                   2.76-5+deb9u1
ii  isc-dhcp-server                           4.3.5-3
ii  ldm-server                                2:2.2.18-2
ii  libasound2-plugins                        1.1.1-1
ii  ltsp-docs                                 1.2-1
ii  ltspfs                                    1.4-2+b1
ii  marco [x-window-manager]                  1.16.1-1
ii  mate-desktop-environment                  1.16.0+1
ii  mate-session-manager [x-session-manager]  1.16.1-1
pn  pulseaudio                                <none>
pn  qemu-user-static                          <none>
pn  sdm                                       <none>
ii  x11-utils                                 7.7+3+b1
ii  xauth                                     1:1.0.9-1+b2

-- debconf information:
  ltsp-server/build_client: false