Warning: this will probably break something. If you need sound, don't remove the "alsa" packages
sudo apt-get --yes purge xserver-common x11-xfs-utils x11-xserver-utils xinit libsmbclient blt gvfs gvfs-backends gvfs-daemons gvfs-fuse idle idle-python2.7 idle-python3.2 idle3 libaudio2 libice6 liblightdm-gobject-1-0 libobrender27 libpulse0 libqt4-svg libqtgui4 libsdl-image1.2 libsdl-mixer1.2 libsdl-ttf2.0-0 libsdl1.2debian libsm6 libsmpeg0 libwebkitgtk-1.0-0 libwebkitgtk-3.0-0 libxaw7 libxklavier16 libxmu6 libxss1 libxt6 libxtst6 lightdm lightdm-gtk-greeter lxde lxde-core midori nano obconf openbox python-pygame python-tk python3-tk scratch tk8.5 wpagui x11-common x11-utils x11-xkb-utils xinit xserver-common xserver-xorg xserver-xorg-core xserver-xorg-input-all xserver-xorg-input-evdev xserver-xorg-input-synaptics xserver-xorg-video-fbdev zenity xserver* x11-common x11-utils x11-xkb-utils x11-xserver-utils xarchiver xauth xkb-data console-setup xinit lightdm libx{composite,cb,cursor,damage,dmcp,ext,font,ft,i,inerama,kbfile,klavier,mu,pm,randr,render,res,t,xf86}* lxde* lx{input,menu-data,panel,polkit,randr,session,session-edit,shortcut,task,terminal} obconf openbox gtk* libgtk* alsa* nano python-pygame python-tk python3-tk scratch tsconf desktop-file-utils cifs-utils samba-common smbclient
The above, plus (Warning, not really tested, may break stuff (eg my wireless broke after doing this))
sudo apt-get --yes purge cups-bsd cups-client fonts-droid fuse gettext-base ghostscript gnome-accessibility-themes gnome-themes-standard-data libasound2 libasprintf0c2 libasyncns0 libaudit0 libcaca0 libcupsimage2 libfile-copy-recursive-perl libflac8 libfm-data libfuse2 libgif4 libgs9 libgs9-common libid3tag0 libijs-0.35 libjbig2dec0 libjson0 libmad0 libmenu-cache1 libmikmod2 libmtdev1 libogg0 libopenjpeg2 libpaper-utils libpaper1 libpciaccess0 libpoppler19 libportmidi0 libqt4-network libqt4-xml libqtdbus4 libsamplerate0 libsndfile1 libutempter0 libvorbis0a libvorbisenc2 libvorbisfile3 libvte-common libwebp2 libwnck-common poppler-data python-numpy python-support tcl8.5 update-inetd xbitmaps zenity-common aspell aspell-en console-setup-linux cups-common dconf-gsettings-backend dconf-service dictionaries-common fontconfig fontconfig-config gconf2-common glib-networking glib-networking-common glib-networking-services gsettings-desktop-schemas gsfonts hicolor-icon-theme iso-codes libaspell15 libatk1.0-0 libatk1.0-data libavahi-client3 libavahi-common-data libavahi-common3 libavahi-glib1 libbluetooth3 libbluray1 libcdio-cdda1 libcdio-paranoia1 libcdio13 libck-connector0 libcolord1 libcups2 libdatrie1 libdconf0 libdrm2 libenchant1c2a libexif12 libfontconfig1 libfontenc1 libgconf-2-4 libgdk-pixbuf2.0-common libgdu0 libglapi-mesa libgnome-keyring-common libgnome-keyring0 libgphoto2-port0 libhunspell-1.3-0 libicu48 libjasper1 libjpeg8 liblcms1 liblcms2-2 libltdl7 libmng1 libnettle4 liborc-0.4-0 libpam-ck-connector libpixman-1-0 libpolkit-agent-1-0 libpolkit-backend-1-0 libproxy0 libqtcore4 libthai-data libthai0 libtiff4 netsurf-common sgml-base ttf-dejavu-core xml-core
sudo apt-get purge python-rpi.gpio
sudo apt-get --yes autoremove
sudo apt-get --yes autoclean
sudo apt-get --yes clean
apt-get purge might delete these for you:
sudo rm -r /usr/lib/xorg/modules/linux /usr/lib/xorg/modules/extensions /usr/lib/xorg/modules /usr/lib/xorg
rm -r ~/Desktop
rm -r ~/python_games
do an update/upgrade:
sudo apt-get --yes update
sudo apt-get --yes upgrade
It's a good idea to regenerate the ssh keys rather than use the ones on the image.
sudo rm /etc/ssh/ssh_host_* && sudo dpkg-reconfigure openssh-server
You may need to clear out the old keys in .ssh/know_hosts on the client:
ssh-keygen -R [IP]
Change the pi user to one better suited to you. Mount the SD card in another linux box:
sudo shutdown -h now
put SD card in another linux host
dmesg | tail
sudo mount /dev/sdx2 /mnt/tmp
and perform the following:
sudo vi /mnt/tmp/etc/passwd
sudo vi /mnt/tmp/etc/group
sudo vi /mnt/tmp/etc/shadow
sudo vi /mnt/tmp/etc/gshadow
sudo vi /mnt/tmp/etc/sudoers
sudo mv /mnt/tmp/home/pi /mnt/tmp/home/[username]
umount and put back in your pi:
sudo umount /mnt/tmp