This howto describes how to install Phoscon DeCONZ software using minimal installation. Everything is done as the root user in this howto.

Download Raspbian Buster Lite edition at: https://www.raspberrypi.org/downloads/raspbian/ Use Etcher or whatever to install the downloaded zip on a SD card.

Use raspi-config to set network and change password of the pi user and change the hostname:

raspi-config

systemctl enable ssh.service
systemctl start ssh.service

Disable swap

dphys-swapfile swapoff
dphys-swapfile uninstall
systemctl disable dphys-swapfile

/etc/systemd/timesyncd.conf

[Time]
NTP=172.16.0.254
#FallbackNTP=0.debian.pool.ntp.org 1.debian.pool.ntp.org 2.debian.pool.ntp.org 3.debian.pool.ntp.org
#RootDistanceMaxSec=5
#PollIntervalMinSec=32
#PollIntervalMaxSec=2048

apt install \
  curl \
  kmod \
  libcap2-bin \
  libqt5core5a \
  libqt5gui5 \
  libqt5network5 \
  libqt5serialport5 \
  libqt5sql5 \
  libqt5websockets5 \
  libqt5widgets5 \
  lsof \
  sqlite3 \
  tigervnc-standalone-server \
  tigervnc-common \
  wmii \
  xfonts-base \
  xfonts-scalable

/etc/systemd/system/vncserver@:0.service

# Vncserver service file for Debian or Ubuntu with systemd
#
# 1. Copy this file to /etc/systemd/system/vncserver@:1.service
# 2. Edit User=
#    e.g "User=paul"
# 3. Edit the vncserver parameters appropriately in the ExecStart= line!
#    e.g. the -localhost option only allows connections from localhost (or via ssh tunnels)
# 4. Run `systemctl daemon-reload`
# 5. Run `systemctl enable vncserver@:<display>.service`
#

[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target

[Service]
Type=forking
User=pi

# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/tigervncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/usr/bin/tigervncserver -SecurityTypes VncAuth,TLSVnc %i
ExecStop=/usr/bin/tigervncserver -kill %i

[Install]
WantedBy=multi-user.target

/etc/X11/Xvnc-session

.
.
-- vncconfig -iconic &
++ vncconfig -nowin &
.
.

As user pi

tigervncpasswd

This creates a .vnc directory in the homedir of user pi with a passwd file in it. This is mandatory for the daemon to load.

systemctl daemon-reload
systemctl start vncserver@\:0.service
systemctl enable vncserver@\:0.service

Check with a VNC client if you can connect to the VNC server.

wget -O - http://phoscon.de/apt/deconz.pub.key | \
  apt-key add -

sh -c "echo 'deb http://phoscon.de/apt/deconz \
  $(lsb_release -cs) main' > \
  /etc/apt/sources.list.d/deconz.list"

apt update
apt install deconz

systemctl enable deconz-gui
systemctl start deconz-gui

I do not want to update manually.

apt install unattended-upgrades apt-listchanges

cp /etc/apt/apt.conf.d/50unattended-upgrades /etc/apt/apt.conf.d/52unattended-upgrades

/etc/apt/apt.conf.d/52unattended-upgrades

.
.
Unattended-Upgrade::Origins-Pattern {
        // Codename based matching:
        // This will follow the migration of a release through different
        // archives (e.g. from testing to stable and later oldstable).
        // Software will be the latest available for the named release,
        // but the Debian release itself will not be automatically upgraded.
        "origin=Raspbian,codename=${distro_codename},label=Raspbian";
        "origin=Raspberry Pi Foundation,codename=${distro_codename},label=Raspberry Pi Foundation";
        "origin=phoscon.de,codename=${distro_codename}";

        // Archive or Suite based matching:
        // Note that this will silently match a different release after
        // migration to the specified archive (e.g. testing becomes the
        // new stable).
//      "o=Debian,a=stable";
//      "o=Debian,a=stable-updates";
//      "o=Debian,a=proposed-updates";
//      "o=Debian Backports,a=${distro_codename}-backports,l=Debian Backports";
};
.
.
.
// Remove unused automatically installed kernel-related packages
// (kernel images, kernel headers and kernel version locked tools).
Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";

// Do automatic removal of newly unused dependencies after the upgrade
Unattended-Upgrade::Remove-New-Unused-Dependencies "true";

// Do automatic removal of unused packages after the upgrade
// (equivalent to apt-get autoremove)
Unattended-Upgrade::Remove-Unused-Dependencies "true";

// Automatically reboot *WITHOUT CONFIRMATION* if
//  the file /var/run/reboot-required is found after the upgrade
Unattended-Upgrade::Automatic-Reboot "true";

// Automatically reboot even if there are users currently logged in
// when Unattended-Upgrade::Automatic-Reboot is set to true
Unattended-Upgrade::Automatic-Reboot-WithUsers "true";

// If automatic reboot is enabled and needed, reboot at the specific
// time instead of immediately
//  Default: "now"
Unattended-Upgrade::Automatic-Reboot-Time "02:00";
.
.

Test

unattended-upgrades -d

This should not give any error

dpkg-reconfigure -plow unattended-upgrades