***   für einen Mini-Server-Betrieb, graf. Modus beibehalten:
( https://blog.php-function.de/raspberry-pi-vorinstallierte-unnoetige-software-deinstallieren/ )
Unter http://knowledgebase.twocoders.de/2013/11/05/raspberry-pi-uninstall-unused-software/ 
findet ihr einen netten kleinen Artikel, welche Software ihr bedenkenlos entfernen könnt. 
Leider war mir das dann doch zu rigoros (wollte nämlich im TV-Betrieb gern den grafischen Modus behalten), 
weshalb ich die zu entfernenden Pakete reduziert und ein paar andere ergänz habe:

sudo apt-get purge --auto-remove idle idle3
sudo apt-get purge --auto-remove scratch
sudo apt-get purge --auto-remove sonic-pi
sudo apt-get purge --auto-remove squeak-vm
sudo apt-get purge --auto-remove timidity
sudo apt-get purge --auto-remove wolfram-engine
sudo apt-get purge --auto-remove libreoffice*
sudo apt-get purge --auto-remove bluej*
sudo apt-get purge --auto-remove greenfoot*
sudo apt-get purge --auto-remove python-pygame penguinspuzzle
sudo apt-get purge --auto-remove lxappearance lxde lxde-common lxde-core lxde-icon-themexinput lxmenu-data lxpanel lxpolkit lxrandr lxsession lxsession-edit lxshortcut lxtask lxterminal
sudo apt-get purge --auto-remove leafpad menu-xdg omxplayer xarchiver
sudo apt-get purge --auto-remove zenity pcmanfm blt python-tk python3-tk
sudo apt-get purge --auto-remove dillo openbox
sudo apt-get purge --auto-remove pistore 
sudo apt-get purge --auto-remove gnome-icon-theme-symbolic
sudo apt-get purge --auto-remove pypy-setuptools pypy-upstream pypy-upstream-dev
sudo apt-get purge --auto-remove epiphany-browser epiphany-browser-data
#sudo apt-get purge --auto-remove xinit xserver-xorg lightdm midori desktop-base gnome-icon-theme gnome-themes-standard

basiert auf nächstem Artikel:


***   Raspberry Pi as Homeserver
( https://www.stefan-seelmann.de/wiki/rasperrypi-homeserver )

Use maximum memory for applications as the Pi is operated in headless mode and no video output is required.
# cp arm240_start.elf start.elf

Create link to start SSH server:
# cd etc/rc2.d
# ln -s ../init.d/ssh S03ssh

Set a static IP address:
# cat /etc/network/interfaces 
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address 192.168.2.2
  netmask 255.255.255.0
  gateway 192.168.2.1

# cat /etc/resolv.conf
nameserver 192.168.2.1


Delete unused software packages, in reverse order of /var/log/apt/history.log, including automatically installed packages:

# apt-get purge --auto-remove scratch
# apt-get purge --auto-remove debian-reference-en dillo idle3 python3-tk idle python-pygame python-tk
# apt-get purge --auto-remove lightdm gnome-themes-standard gnome-icon-theme raspberrypi-artwork
# apt-get purge --auto-remove gvfs-backends gvfs-fuse desktop-base lxpolkit netsurf-gtk zenity xdg-utilse
# apt-get purge --auto-remove mupdf gtk2-engines alsa-utils  lxde lxtask menu-xdg gksu
# apt-get purge --auto-remove midori xserver-xorg xinit xserver-xorg-video-fbdev
# apt-get purge --auto-remove libraspberrypi-dev libraspberrypi-doc
# apt-get purge --auto-remove dbus-x11 libx11-6 libx11-data libx11-xcb1 x11-common x11-utils
# apt-get purge --auto-remove lxde-icon-theme gconf-service gconf2-common
Upgrade

# apt-get update
# apt-get dist-upgrade