Bug#854548: xrdp-sesman.service fails to start

[Piviul]

Package: xrdp
Version: 0.9.1-4
Severity: grave
Justification: renders package unusable

Dear Maintainer,
the installation of xrdp fails sayng:
[...]
Created symlink /etc/systemd/system/multi-user.target.wants/xrdp-sesman.service
-> /lib/systemd/system/xrdp-sesman.service.
Created symlink /etc/systemd/system/multi-user.target.wants/xrdp.service ->
/lib/systemd/system/xrdp.service.
A dependency job for xrdp.service failed. See 'journalctl -xe' for details.
invoke-rc.d: initscript xrdp, action "start" failed.
* xrdp.service - xrdp daemon
   Loaded: loaded (/lib/systemd/system/xrdp.service; enabled; vendor preset:
enabled)
   Active: inactive (dead)
     Docs: man:xrdp(8)
           man:xrdp.ini(5)

Feb 08 08:23:00 psala-lx2 systemd[1]: Dependency failed for xrdp daemon.
Feb 08 08:23:00 psala-lx2 systemd[1]: xrdp.service: Job xrdp.service/start
failed with result 'dependency'.
Feb 08 08:23:51 psala-lx2 systemd[1]: Dependency failed for xrdp daemon.
Feb 08 08:23:51 psala-lx2 systemd[1]: xrdp.service: Job xrdp.service/start
failed with result 'dependency'.
Feb 08 08:39:04 psala-lx2 systemd[1]: Dependency failed for xrdp daemon.
Feb 08 08:39:04 psala-lx2 systemd[1]: xrdp.service: Job xrdp.service/start
failed with result 'dependency'.
Feb 08 08:39:14 psala-lx2 systemd[1]: Dependency failed for xrdp daemon.
Feb 08 08:39:14 psala-lx2 systemd[1]: xrdp.service: Job xrdp.service/start
failed with result 'dependency'.
Feb 08 08:40:24 psala-lx2 systemd[1]: Dependency failed for xrdp daemon.
Feb 08 08:40:24 psala-lx2 systemd[1]: xrdp.service: Job xrdp.service/start
failed with result 'dependency'.
dpkg: error processing package xrdp (--configure):
 subprocess installed post-installation script returned error exit status 1
Processing triggers for systemd (232-15) ...
Processing triggers for man-db (2.7.6.1-2) ...
Setting up xorgxrdp (0.9.1-4) ...
Processing triggers for libc-bin (2.24-9) ...
Errors were encountered while processing:
 xrdp
E: Sub-process /usr/bin/dpkg returned an error code (1)

The dependency problem seems to be tied to xrdp-sesman.service that hangs on
starting:

$ systemctl status xrdp-sesman.service
● xrdp-sesman.service - xrdp session manager
   Loaded: loaded (/lib/systemd/system/xrdp-sesman.service; enabled; vendor
preset: enabled)
   Active: failed (Result: resources) since Wed 2017-02-08 08:50:29 CET; 1min
44s ago
     Docs: man:xrdp-sesman(8)
           man:sesman.ini(5)
  Process: 5850 ExecStart=/usr/sbin/xrdp-sesman $SESMAN_OPTIONS (code=exited,
status=0/SUCCESS)

$ sudo cat /var/log/xrdp-sesman.log
[20170208-08:40:24] [DEBUG] libscp initialized
[20170208-08:40:24] [ERROR] error opening pid file[/var/run/xrdp/xrdp-
sesman.pid]: No such file or directory
[20170208-08:40:24] [CORE ] shutting down log subsystem...
[20170208-08:50:29] [DEBUG] libscp initialized
[20170208-08:50:29] [ERROR] error opening pid file[/var/run/xrdp/xrdp-
sesman.pid]: No such file or directory
[20170208-08:50:29] [CORE ] shutting down log subsystem...




-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages xrdp depends on:
ii  adduser              3.115
ii  init-system-helpers  1.47
ii  libc6                2.24-9
ii  libfuse2             2.9.7-1
ii  libjpeg62-turbo      1:1.5.1-2
ii  libopus0             1.2~alpha2-1
ii  libpam0g             1.1.8-3.5
ii  libssl1.1            1.1.0c-2
ii  libx11-6             2:1.6.4-3
ii  libxfixes3           1:5.0.3-1
ii  libxrandr2           2:1.5.1-1
ii  lsb-base             9.20161125
ii  ssl-cert             1.0.38

Versions of packages xrdp recommends:
ii  fuse      2.9.7-1
ii  xorgxrdp  0.9.1-4

Versions of packages xrdp suggests:
pn  guacamole  <none>

Versions of packages xorgxrdp depends on:
ii  libc6                                  2.24-9
pn  xorg-input-abi-24                      <none>
ii  xserver-xorg-core [xorg-video-abi-23]  2:1.19.1-4

Versions of packages xorgxrdp recommends:
ii  xorg  1:7.7+18

Versions of packages xrdp is related to:
pn  vnc-server           <none>
pn  xserver-xorg-legacy  <none>

-- no debconf information