Removing mono-complete (4.6.2.7+dfsg-1ubuntu1) ...
Setting up mono-xsp4 (4.2-2.1) ...
Using Mono XSP 4 port: 8084
Binding Mono XSP 4 address: 0.0.0.0
Use of uninitialized value $libs in concatenation (.) or string at /usr/sbin/mono-xsp4-update line 216.
Job for mono-xsp4.service failed because a timeout was exceeded.
See "systemctl  status mono-xsp4.service" and "journalctl  -xe" for details.
invoke-rc.d: initscript mono-xsp4, action "start" failed.
[0;1;31m●[0m mono-xsp4.service - LSB: Mono XSP4
   Loaded: loaded (/etc/init.d/mono-xsp4; generated; vendor preset: enabled)
   Active: [0;1;31mfailed[0m (Result: timeout) since Fri 2017-11-03 22:17:46 CET; 12ms ago
     Docs: man:systemd-sysv-generator(8)
    Tasks: 4 (limit: 4915)
   CGroup: /system.slice/mono-xsp4.service
           ├─22135 plymouth --ping
           ├─23167 plymouth --ping
           └─25003 plymouth --ping

Nov 03 22:12:46 proxy systemd[1]: Starting LSB: Mono XSP4...
Nov 03 22:17:46 proxy systemd[1]: [0;1;39mmono-xsp4.service: Start operation timed out. Terminating.[0m
Nov 03 22:17:46 proxy systemd[1]: [0;1;31mFailed to start LSB: Mono XSP4.[0m
Nov 03 22:17:46 proxy systemd[1]: [0;1;39mmono-xsp4.service: Unit entered failed state.[0m
Nov 03 22:17:46 proxy systemd[1]: [0;1;39mmono-xsp4.service: Failed with result 'timeout'.[0m
[1mdpkg:[0m error processing package mono-xsp4 (--configure):
 subprocess installed post-installation script returned error exit status 1