Setup new image:

* BACKUP CURRENT HOME
* REMOVE NETWORK PLUG

* 1st login xfce
* copy this file to /home/morona / open with gedit / setup colour theme

As root:
* systemctl disable serial-getty@ttyS0
* systemctl disable serial-getty@ttyAMA0
* systemctl enable dbus-broker.service
* systemctl --global enable dbus-broker.service
* create /home/<user>/.asoundrc with (soundcards can be sndrpihifiberry/audioinjectorpi...)
    pcm.!default {
        type hw
        card sndrpihifiberry
    }
    ctl.!default {
        type hw
        card sndrpihifiberry
    }
* audioinjector: enable mixer control "Output Mixer HiFi"
* passwd

As user:
* passwd
* check session autostart (evt. disable blueman/baloo/tracker/scrensaver..)
* datetime: timezone
* optionally for a tiny better performance: reduce screen resolution (yes really tested: 1280x1024 / 1280x720 are fine)
* check /var/log/postinstall.log
* restart
* network plug
* check journalctl output
* check systemd-analyze: Can be 8-9s
* glmark2-es2: On Pi3 (no B+) ~145 / On Pi 4 ~269
* chromium unselect 'Allow Chromium-sign-in / add ad-blocker / check youtube music-video
* libreoffice: open documents to set libreoffice default
* jack setup
* qtractor midiimport / open reference-project and check all instruments
* ardour5/6
* qmmp/projectm
* mixxx
* vlc
* supercollider
* krita/kdenlive/kalzium
* set-up git (.gitconfig) / ssh-keygen -> github
* qt-creator 
    standard build directory:
      /home/morona/tmp/qtbuilds/build-%{CurrentProject:Name}-%{CurrentKit:FileSystemName}-%{CurrentBuild:Name}
    help/about plugins
      disable ClangCodeModel
    kit/compiler:
      set gcc explicitly - clang causes trouble on qml-register functions
    kit/cmake:
      CMAKE_INSTALL_PREFIX:STRING=/home/morona/tmp/qtinstalls/usr
      CMAKE_PREFIX_PATH:STRING=/home/morona/tmp/qtinstalls/usr;%{Qt:QT_INSTALL_PREFIX}
      OE_QMAKE_PATH_EXTERNAL_HOST_BINS:STRING=/usr/bin
* clone avr projects & build them
* kicad: open example / check 3d preview
* mame: set video opengl / test some ROMs
* vice: select cairo
* dosbox / dosbox-x / stella
* supertux(kart??)
* open all available desktops