.:Server returned error NXDOMAIN (systemd-resolved.service):.
$ systemctl status systemd-resolved
$ sudo unlink /etc/resolv.conf
$ sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
$ sudo systemctl restart systemd-resolved
$ systemctl status systemd-resolved

.:Disable:anacron.timer - Trigger anacron every hour:.
$ sudo systemctl disable anacron.timer

.:Modifier sudo Time-out (60 min), (à insérer en fin de fichier):.
$ sudo EDITOR=nano visudo
Defaults        timestamp_timeout=60

.:WebRTC leaks (https://ipleak.net/):.
Mozilla Firefox: Type "about:config” in the address bar. Scroll down to “media.peerconnection.enabled”, double click to set it to false.
Google Chrome: Install Google official extension WebRTC Network Limiter.

FATAL:setuid_sandbox_host.cc(157)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /usr/share/skypeforlinux/chrome-sandbox is owned by root and has mode 4755.

.:ufw - allow in all igmp traffic to (Multicast):.
#ufw allow in to from 192.168.?.? proto igmp

# see "man logrotate" for details
# rotate log files weekly

# use the adm group by default, since this is the owning group
# of /var/log/syslog.
su root adm

# keep 4 weeks worth of backlogs
rotate 4

# create new (empty) log files after rotating old ones

# use date as a suffix of the rotated file

# uncomment this if you want your log files compressed

# packages drop log rotation information into this directory
#include /etc/logrotate.d

# system-specific logs may be also be configured here.
/var/log/* {

.:'.TecNetwork/ColorDefault.conf' + chmod 755:.
# TecNetwork - configuration file for panel's color. Please don't delete this file !

.:'.TecNetwork/trailer.rc' + chmod 755:.
printf "\n< OK > " 1>&2 ; read -t 300 dummy