I’ve corrected the rsyslog installation process concerning the xconsole section.
In fact as we did not use X server, we did not need this part.
Here is the diff:
Edit 50-default.conf to correct the path
sudo nano /etc/rsyslog.d/50-default.conf
At the end of the file, comment the xconsole section:
#daemon.*;mail.*;\ # news.err;\ # *.=debug;*.=info;\ # *.=notice;*.=warn |/dev/xconsole
sudo service rsyslog restart