How to remove GNOME completely?
After installing Ubuntu 12.10 desktop edition, here's how you remove Unity, X11 and any graphical applications that come installed by default:
Log out, and press Ctrl-Alt-F1 to enter the first virtual terminal, leaving X's graphical environment. If you're using VirtualBox and are in a virtual machine, press Right Ctrl-F1 instead.
Enter your username and password.
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Run this command to remove Unity:
sudo apt-get remove unity \ unity-asset-pool \ unity-services \ 'unity-lens-.*' \ 'unity-scope-.*' \ 'liboverlay-scrollbar.*' \ appmenu-gtk \ appmenu-gtk3 \ appmenu-qt \ firefox-globalmenu \ thunderbird-globalmenu \ unity-common \ 'libunity.*' \ unity-greeter \ 'unity-webapps-.*' \ 'indicator-.*' \ xul-ext-unity -
Run this command to remove X, graphical programs and anything else that you wouldn't expect on a server. This list was generated by comparing the list of installed packages on a freshly installed Ubuntu 12.10 desktop system, and a freshly installed Ubuntu 12.10 server system.
sudo apt-get remove \ account-plugin-aim \ account-plugin-facebook \ account-plugin-flickr \ account-plugin-google \ account-plugin-icons \ account-plugin-identica \ account-plugin-jabber \ account-plugin-salut \ account-plugin-twitter \ account-plugin-windows-live \ account-plugin-yahoo \ acl \ acpi-support \ activity-log-manager-common \ activity-log-manager-control-center \ adium-theme-ubuntu \ aisleriot \ alsa-base \ alsa-utils \ anacron \ apg \ app-install-data \ app-install-data-partner \ apport-gtk \ aptdaemon-data \ aptdaemon \ apturl-common \ apturl \ aspell-en \ aspell \ at-spi2-core \ avahi-autoipd \ avahi-daemon \ avahi-utils \ bamfdaemon \ baobab \ bluez-alsa \ bluez-cups \ bluez-gstreamer \ bluez \ branding-ubuntu \ brasero-cdrkit \ brasero-common \ brasero \ brltty \ checkbox \ checkbox-qt \ colord \ compiz-core \ compiz-gnome \ compiz \ compiz-plugins-default \ cracklib-runtime \ cryptsetup-bin \ cups-bsd \ cups-client \ cups-common \ cups-filters \ cups \ cups-ppdc \ dbus-x11 \ dc \ dconf-gsettings-backend \ dconf-service \ dconf-tools \ deja-dup \ desktop-file-utils \ dictionaries-common \ diffstat \ dmz-cursor-theme \ dnsmasq-base \ doc-base \ duplicity \ dvd+rw-tools \ empathy-common \ empathy \ enchant \ eog \ espeak-data \ evince-common \ evince \ evolution-data-server-common \ evolution-data-server \ example-content \ file-roller \ firefox-gnome-support \ firefox \ firefox-locale-en \ folks-common \ fontconfig-config \ fontconfig \ fonts-freefont-ttf \ fonts-kacst \ fonts-kacst-one \ fonts-khmeros-core \ fonts-lao \ fonts-liberation \ fonts-lklug-sinhala \ fonts-nanum \ fonts-opensymbol \ fonts-sil-abyssinica \ fonts-sil-padauk \ fonts-takao-pgothic \ fonts-thai-tlwg \ fonts-tibetan-machine \ fonts-tlwg-garuda \ fonts-tlwg-kinnari \ fonts-tlwg-loma \ fonts-tlwg-mono \ fonts-tlwg-norasi \ fonts-tlwg-purisa \ fonts-tlwg-sawasdee \ fonts-tlwg-typewriter \ fonts-tlwg-typist \ fonts-tlwg-typo \ fonts-tlwg-umpush \ fonts-tlwg-waree \ foomatic-db-compressed-ppds \ foomatic-db-engine \ foomatic-filters \ freerdp-x11 \ gcalctool \ gconf2-common \ gconf2 \ gconf-service-backend \ gconf-service \ gcr \ gdb \ gedit-common \ gedit \ genisoimage \ geoclue \ geoclue-ubuntu-geoip \ gettext \ ghostscript-cups \ ghostscript \ ghostscript-x \ gir1.2-accounts-1.0 gir1.2-appindicator3-0.1 gir1.2-atk-1.0 gir1.2-atspi-2.0 gir1.2-dbusmenu-glib-0.4 gir1.2-dee-1.0 gir1.2-freedesktop gir1.2-gdata-0.0 gir1.2-gdkpixbuf-2.0 gir1.2-gmenu-3.0 gir1.2-gnomebluetooth-1.0 gir1.2-gnomekeyring-1.0 gir1.2-goa-1.0 gir1.2-gst-plugins-base-0.10 gir1.2-gstreamer-0.10 gir1.2-gtk-3.0 gir1.2-gtksource-3.0 gir1.2-gudev-1.0 gir1.2-indicate-0.7 gir1.2-javascriptcoregtk-3.0 gir1.2-messagingmenu-1.0 gir1.2-notify-0.7 gir1.2-pango-1.0 gir1.2-peas-1.0 gir1.2-rb-3.0 gir1.2-signon-1.0 gir1.2-soup-2.4 gir1.2-syncmenu-0.1 gir1.2-totem-1.0 gir1.2-totem-plparser-1.0 gir1.2-ubuntuoneui-3.0 gir1.2-unity-5.0 gir1.2-vte-2.90 gir1.2-webkit-3.0 gir1.2-wnck-3.0 \ gksu \ glib-networking-common \ glib-networking \ glib-networking-services \ gnome-accessibility-themes gnome-bluetooth gnome-contacts gnome-control-center-data gnome-control-center gnome-control-center-signon gnome-desktop3-data gnome-disk-utility gnome-font-viewer gnome-games-data gnome-icon-theme gnome-icon-theme-symbolic gnome-keyring gnome-mahjongg gnome-media gnome-menus gnome-online-accounts gnome-orca gnome-power-manager gnome-screensaver gnome-screenshot gnome-session-bin gnome-session-canberra gnome-session-common gnome-session gnome-settings-daemon gnome-sudoku gnome-system-log gnome-system-monitor gnome-terminal-data gnome-terminal gnome-user-guide gnome-user-share \ gnomine \ growisofs \ gsettings-desktop-schemas \ gsfonts \ gstreamer0.10-alsa \ gstreamer0.10-gconf \ gstreamer0.10-nice \ gstreamer0.10-plugins-base-apps \ gstreamer0.10-plugins-base \ gstreamer0.10-plugins-good \ gstreamer0.10-pulseaudio \ gstreamer0.10-tools \ gstreamer0.10-x \ gtk2-engines \ gtk2-engines-murrine \ gtk3-engines-unico \ gucharmap \ guile-1.8-libs \ gvfs-backends \ gvfs-bin \ gvfs-common \ gvfs-daemons \ gvfs-fuse \ gvfs \ gvfs-libs \ gwibber \ gwibber-service-facebook \ gwibber-service-identica \ gwibber-service \ gwibber-service-twitter \ hardening-includes \ hicolor-icon-theme \ hpijs \ hplip-data \ hplip \ humanity-icon-theme \ hunspell-en-us \ hwdata \ ibus-gtk3 \ ibus-gtk \ ibus \ ibus-pinyin-db-android \ ibus-pinyin \ ibus-table \ im-switch \ indicator-appmenu \ indicator-datetime \ indicator-printers \ inputattach \ intel-gpu-tools \ intltool-debian \ iputils-arping \ iw \ kerneloops-daemon \ landscape-client-ui-install \ language-pack-en-base \ language-pack-en \ language-pack-gnome-en-base \ language-pack-gnome-en \ language-selector-gnome \ libaa1 libaccount-plugin-1.0-0 libaccounts-glib0 libaccounts-qt1 libappindicator1 libappindicator3-1 libapt-pkg-perl libarchive12 libarchive-zip-perl libart-2.0-2 libasound2 libasound2-plugins libaspell15 libasyncns0 libatasmart4 libatk1.0-0 libatk1.0-data libatk-adaptor-data libatk-adaptor libatk-bridge2.0-0 libatkmm-1.6-1 libatspi2.0-0 libaudio2 libavahi-client3 libavahi-common3 libavahi-common-data libavahi-core7 libavahi-glib1 libavahi-gobject0 libavc1394-0 libbamf3-0 libbluetooth3 libboost-date-time1.49.0 libbrasero-media3-1 libbrlapi0.5 libburn4 libcaca0 libcairo2 libcairo-gobject2 libcairomm-1.0-1 libcairo-perl libcamel-1.2-40 libcanberra0 libcanberra-gtk0 libcanberra-gtk3-0 libcanberra-gtk3-module libcanberra-gtk-module libcanberra-pulse libcap2-bin libcap2 libcdio13 libcdio-cdda1 libcdio-paranoia1 libcdparanoia0 libclone-perl libclutter-1.0-0 libclutter-1.0-common libclutter-gst-1.0-0 libclutter-gtk-1.0-0 libcmis-0.2-2 libcogl9 libcogl-common libcogl-pango0 libcolord1 libcompizconfig0 libcrack2 libcroco3 libcrypt-passwdmd5-perl libcryptsetup4 libcups2 libcupscgi1 libcupsfilters1 libcupsimage2 libcupsmime1 libcupsppdc1 libcurl3-nss libdaemon0 libdatrie1 libdbusmenu-glib4 libdbusmenu-gtk3-4 libdbusmenu-gtk4 libdbusmenu-qt2 libdconf1 libdecoration0 libdee-1.0-4 libdevmapper-event1.02.1 libdigest-hmac-perl libdiscid0 libdjvulibre21 libdjvulibre-text libdmapsharing-3.0-2 libdotconf1.0 libdrm-nouveau2 libdv4 libebackend-1.2-5 libebook-1.2-14 libecal-1.2-15 libedata-book-1.2-15 libedata-cal-1.2-18 libedataserver-1.2-17 libemail-valid-perl libenchant1c2a libespeak1 libevdocument3-4 libevview3-3 libexempi3 libexif12 libexiv2-12 libexttextcat-1.0-0 libexttextcat-data libfarstream-0.1-0 libfile-basedir-perl libfile-copy-recursive-perl libfile-desktopentry-perl libfile-mimeinfo-perl libflac8 libfolks25 libfolks-eds25 libfolks-telepathy25 libfontconfig1 libfontembed1 libfontenc1 libframe6 libfreerdp1 libfreerdp-plugins-standard libfs6 libgail18 libgail-3-0 libgail-common libgck-1-0 libgconf-2-4 libgcr-3-1 libgcr-3-common libgd2-xpm libgdata13 libgdata-common libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgee2 libgeis1 libgeoclue0 libgettextpo0 libgexiv2-1 libgksu2-0 libgl1-mesa-dri libgl1-mesa-glx libglapi-mesa libglew1.8 libglewmx1.8 libglib2.0-bin libglib2.0-data libglibmm-2.4-1c2a libglib-perl libglu1-mesa libgmime-2.6-0 libgnome-bluetooth11 libgnome-control-center1 libgnome-desktop-3-4 libgnomekbd8 libgnomekbd-common libgnome-keyring0 libgnome-keyring-common libgnome-media-profiles-3.0-0 libgnome-menu2 libgnome-menu-3-0 libgoa-1.0-0 libgoa-1.0-common libgpgme11 libgphoto2-2 libgphoto2-l10n libgphoto2-port0 libgpod4 libgpod-common libgrail5 libgrip0 libgs9-common libgs9 libgssdp-1.0-3 libgstreamer0.10-0 libgstreamer-plugins-base0.10-0 libgtk2.0-0 libgtk2.0-bin libgtk2.0-common libgtk2-perl libgtk-3-0 libgtk-3-bin libgtk-3-common libgtkmm-2.4-1c2a libgtkmm-3.0-1 libgtksourceview-3.0-0 libgtksourceview-3.0-common libgtkspell-3-0 libgtop2-7 libgtop2-common libgucharmap-2-90-7 libgudev-1.0-0 libgupnp-1.0-4 libgupnp-igd-1.0-4 libgusb2 libgutenprint2 libgweather-3-1 libgweather-common libgwibber3 libgwibber-gtk3 libgxps2 libhpmud0 libhunspell-1.3-0 libhyphen0 libibus-1.0-0 libical0 libice6 libicu48 libido3-0.1-0 libiec61883-0 libieee1284-3 libijs-0.35 libimobiledevice3 libindicate5 libindicator3-7 libindicator7 libio-pty-perl libio-socket-inet6-perl libipc-run-perl libisofs6 libjack-jackd2-0 libjasper1 libjavascriptcoregtk-3.0-0 libjbig0 libjbig2dec0 libjpeg8 libjpeg-turbo8 libjs-jquery libjson0 libjson-glib-1.0-0 libjte1 libkpathsea6 liblcms1 liblcms2-2 liblightdm-gobject-1-0 liblircclient0 libllvm3.1 liblouis2 liblouis-data libltdl7 liblua5.1-0 liblvm2app2.2 libmailtools-perl libmeanwhile1 libmessaging-menu0 libmetacity-private0a libmhash2 libminiupnpc8 libmission-control-plugins0 libmng1 libmtdev1 libmtp9 libmtp-common libmtp-runtime libmusicbrainz5-0 libmx-1.0-2 libmx-bin libmx-common libmythes-1.2-0 libnatpmp1 libnautilus-extension1a libneon27-gnutls libnet-dns-perl libnet-domain-tld-perl libnetfilter-conntrack3 libnet-ip-perl libnettle4 libnice10 libnl-route-3-200 libnm-glib4 libnm-glib-vpn1 libnm-gtk0 libnm-gtk-common libnm-util2 libnotify4 libnotify-bin libnspr4 libnss3-1d libnss3 libnss-mdns libnux-3.0-0 libnux-3.0-common liboauth0 libogg0 libopencc1 libopenobex1 liborc-0.4-0 libpackagekit-glib2-14 libpam-cap libpam-freerdp libpam-gnome-keyring libpam-xdg-support libpango1.0-0 libpangomm-1.4-1 libpango-perl libpaper1 libpaper-utils libpeas-1.0-0 libpeas-common libperl5.14 libpixman-1-0 libplist1 libpoppler28 libpoppler-glib8 libportaudio2 libprotobuf7 libprotoc7 libproxy1 libproxy1-plugin-gsettings libproxy1-plugin-networkmanager libpth20 libpulse0 libpulsedsp libpulse-mainloop-glib0 libpurple0 libpurple-bin libpwquality1 libpython3.2 libqjson0 libqpdf8 libqt4-dbus libqt4-declarative libqt4-designer libqt4-help libqt4-network libqt4-script libqt4-scripttools libqt4-sql libqt4-sql-sqlite libqt4-svg libqt4-test libqt4-xml libqt4-xmlpatterns libqtassistantclient4 libqtcore4 libqtgui4 libqtwebkit4 libquvi7 libquvi-scripts libraptor2-0 librasqal3 libraw1394-11 libraw5 librdf0 libreoffice-base-core libreoffice-calc libreoffice-common libreoffice-core libreoffice-draw libreoffice-emailmerge libreoffice-gnome libreoffice-gtk libreoffice-help-en-us libreoffice-impress libreoffice-math libreoffice-ogltrans libreoffice-pdfimport libreoffice-presentation-minimizer libreoffice-presenter-console libreoffice-style-human libreoffice-style-tango libreoffice-writer librest-0.7-0 librhythmbox-core6 librsvg2-2 librsvg2-common librsync1 libsamplerate0 libsane-common libsane-hpaio libsane libsecret-1-0 libsecret-common libsensors4 libsgutils2-2 libshout3 libsignon-extension1 libsignon-glib1 libsignon-plugins-common1 libsignon-qt1 libsm6 libsmbclient libsndfile1 libsnmp15 libsnmp-base libsocket6-perl libsonic0 libsoup2.4-1 libsoup-gnome2.4-1 libspectre1 libspeechd2 libspeex1 libspeexdsp1 libssh-4 libstartup-notification0 libstlport4.6ldbl libsyncdaemon-1.0-1 libsync-menu1 libsysfs2 libt1-5 libtag1c2a libtag1-vanilla libtalloc2 libtdb1 libtelepathy-farstream2 libtelepathy-glib0 libtelepathy-logger2 libthai0 libthai-data libtheora0 libtiff5 libtimezonemap1 libtotem0 libtotem-plparser17 libtxc-dxtn-s2tc0 libubuntuoneui-3.0-1 libudisks2-0 libufe-xidgetter0 libunistring0 libupower-glib1 liburi-perl libusbmuxd2 libutempter0 libuuid-perl libv4l-0 libv4lconvert0 libvisual-0.4-0 libvisual-0.4-plugins libvncserver0 libvorbis0a libvorbisenc2 libvorbisfile3 libvte-2.90-9 libvte-2.90-common libwacom2 libwacom-common libwavpack1 libwbclient0 libwebkitgtk-3.0-0 libwebkitgtk-3.0-common libwmf0.2-7-gtk libwmf0.2-7 libwnck22 libwnck-3-0 libwnck-3-common libwnck-common libwpd-0.9-9 libwpg-0.2-2 libwps-0.2-2 libx11-xcb1 libx86-1 libxatracker1 libxaw7 libxcb-dri2-0 libxcb-glx0 libxcb-render0 libxcb-shape0 libxcb-shm0 libxcb-util0 libxcomposite1 libxcursor1 libxdamage1 libxfixes3 libxfont1 libxft2 libxi6 libxinerama1 libxkbfile1 libxklavier16 libxmu6 libxp6 libxpm4 libxrandr2 libxrender1 libxres1 libxslt1.1 libxt6 libxtst6 libxv1 libxvmc1 libxxf86dga1 libxxf86vm1 libyajl2 libyaml-tiny-perl libyelp0 libzeitgeist-1.0-1 libzephyr4 \ lightdm \ lightdm-remote-session-freerdp \ light-themes \ lintian \ linux-headers-generic-pae \ linux-sound-base \ lvm2 \ mcp-account-manager-uoa \ media-player-info \ metacity-common \ mobile-broadband-provider-info \ modemmanager \ mousetweaks \ mscompress \ mtools \ nautilus-data \ nautilus \ nautilus-sendto-empathy \ nautilus-sendto \ nautilus-share \ network-manager-gnome \ network-manager \ network-manager-pptp-gnome \ network-manager-pptp \ notify-osd-icons \ notify-osd \ nux-tools \ obex-data-server \ obexd-client \ onboard \ oneconf \ openprinting-ppds \ overlay-scrollbar-gtk2 \ overlay-scrollbar-gtk3 \ overlay-scrollbar \ patchutils \ pcmciautils \ pkg-config \ plymouth-label \ plymouth-theme-ubuntu-logo \ pm-utils \ policykit-1-gnome \ policykit-desktop-privileges \ poppler-data \ poppler-utils \ pptp-linux \ printer-driver-c2esp \ printer-driver-foo2zjs \ printer-driver-gutenprint \ printer-driver-hpcups \ printer-driver-hpijs \ printer-driver-min12xxw \ printer-driver-pnm2ppa \ printer-driver-postscript-hp \ printer-driver-ptouch \ printer-driver-pxljr \ printer-driver-sag-gdi \ printer-driver-splix \ protobuf-compiler \ pulseaudio \ pulseaudio-module-bluetooth \ pulseaudio-module-gconf \ pulseaudio-module-x11 \ pulseaudio-utils \ python3-aptdaemon.gtk3widgets \ python3-aptdaemon \ python3-aptdaemon.pkcompat \ python3-brlapi \ python3-cairo \ python3-crypto \ python3-defer \ python3-gi-cairo \ python3-httplib2 \ python3-louis \ python3-lxml \ python3-oauthlib \ python3-pkg-resources \ python3-pyatspi2 \ python3-pycurl \ python3-software-properties \ python3-speechd \ python3-virtkey \ python3-xkit \ python-appindicator \ python-apport \ python-aptdaemon.gtk3widgets \ python-aptdaemon \ python-cairo \ python-configglue \ python-cupshelpers \ python-cups \ python-dbus-dev \ python-dbus \ python-debtagshw \ python-defer \ python-dirspec \ python-gconf \ python-gi-cairo \ python-gi \ python-gnomekeyring \ python-gobject-2 \ python-gobject \ python-gst0.10 \ python-gtk2 \ python-httplib2 \ python-ibus \ python-imaging \ python-libxml2 \ python-lxml \ python-mako \ python-markupsafe \ python-notify \ python-oauth \ python-pexpect \ python-piston-mini-client \ python-problem-report \ python-protobuf \ python-pycurl \ python-pyinotify \ python-qt4-dbus \ python-qt4 \ python-renderpm \ python-reportlab-accel \ python-reportlab \ python-simplejson \ python-sip \ python-smbc \ python-twisted-names \ python-twisted-web \ python-ubuntuone-client \ python-ubuntuone-control-panel \ python-ubuntuone-storageprotocol \ python-ubuntu-sso-client \ python-uno \ python-xdg \ python-zeitgeist \ qdbus \ qpdf \ qt-at-spi \ radeontool \ remmina-common \ remmina \ remmina-plugin-rdp \ remmina-plugin-vnc \ remote-login-service \ rfkill \ rhythmbox-data \ rhythmbox \ rhythmbox-mozilla \ rhythmbox-plugin-cdrecorder \ rhythmbox-plugin-magnatune \ rhythmbox-plugins \ rhythmbox-plugin-zeitgeist \ rhythmbox-ubuntuone \ rtkit \ samba-common-bin \ samba-common \ sane-utils \ seahorse \ sessioninstaller \ session-migration \ shared-mime-info \ shotwell \ signond \ signon-keyring-extension \ signon-plugin-oauth2 \ signon-plugin-password \ signon-ui \ simple-scan \ smbclient \ sni-qt \ software-center-aptdaemon-plugins \ software-center \ software-properties-common \ software-properties-gtk \ sound-theme-freedesktop \ speech-dispatcher \ ssh-askpass-gnome \ ssl-cert \ syslinux-common \ syslinux \ syslinux-legacy \ system-config-printer-common \ system-config-printer-gnome \ system-config-printer-udev \ telepathy-gabble \ telepathy-haze \ telepathy-idle \ telepathy-indicator \ telepathy-logger \ telepathy-mission-control-5 \ telepathy-salut \ thin-client-config-agent \ thunderbird-gnome-support \ thunderbird \ toshset \ totem-common \ totem \ totem-mozilla \ totem-plugins \ transmission-common \ transmission-gtk \ ttf-dejavu-core \ ttf-indic-fonts-core \ ttf-punjabi-fonts \ ttf-ubuntu-font-family \ ttf-wqy-microhei \ ubuntu-artwork \ ubuntu-docs \ ubuntu-drivers-common \ ubuntu-extras-keyring \ ubuntu-mono \ ubuntuone-client-gnome \ ubuntuone-client \ ubuntuone-control-panel \ ubuntuone-control-panel-qt \ ubuntuone-couch \ ubuntu-release-upgrader-gtk \ ubuntu-settings \ ubuntu-sounds \ ubuntu-sso-client \ ubuntu-sso-client-qt \ ubuntu-system-service \ ubuntu-wallpapers \ ubuntu-wallpapers-quantal \ udisks2 \ udisks \ unattended-upgrades \ uno-libs3 \ unzip \ update-inetd \ update-manager \ update-notifier \ upower \ ure \ usb-creator-common \ usb-creator-gtk \ usb-modeswitch-data \ usb-modeswitch \ usbmuxd \ vbetool \ vino \ wamerican \ watershed \ wodim \ x11-apps \ x11-common \ x11-session-utils \ x11-utils \ x11-xfs-utils \ x11-xkb-utils \ x11-xserver-utils \ xbitmaps \ xcursor-themes \ xdg-user-dirs-gtk \ xdg-user-dirs \ xdg-utils \ xdiagnose \ xfonts-base \ xfonts-encodings \ xfonts-mathml \ xfonts-scalable \ xfonts-utils \ xinit \ xinput \ xorg-docs-core \ xorg \ xserver-common \ xserver-xorg-core \ xserver-xorg-input-all \ xserver-xorg-input-evdev \ xserver-xorg-input-mouse \ xserver-xorg-input-synaptics \ xserver-xorg-input-vmmouse \ xserver-xorg-input-wacom \ xserver-xorg \ xserver-xorg-video-all \ xserver-xorg-video-ati \ xserver-xorg-video-cirrus \ xserver-xorg-video-fbdev \ xserver-xorg-video-intel \ xserver-xorg-video-mach64 \ xserver-xorg-video-mga \ xserver-xorg-video-modesetting \ xserver-xorg-video-neomagic \ xserver-xorg-video-nouveau \ xserver-xorg-video-openchrome \ xserver-xorg-video-qxl \ xserver-xorg-video-r128 \ xserver-xorg-video-radeon \ xserver-xorg-video-s3 \ xserver-xorg-video-savage \ xserver-xorg-video-siliconmotion \ xserver-xorg-video-sis \ xserver-xorg-video-sisusb \ xserver-xorg-video-tdfx \ xserver-xorg-video-trident \ xserver-xorg-video-vesa \ xserver-xorg-video-vmware \ xterm \ xul-ext-ubufox \ xul-ext-websites-integration \ yelp \ yelp-xsl \ zeitgeist-core \ zeitgeist-datahub \ zeitgeist \ zenity-common \ zenity \ zip
You might want to consider install Ubuntu server edition instead. It's a minimal installation, so you can install the packages you need, rather than remove the ones you don't.
Also consider using a different Ubuntu flavour if you want a minimal installation. Both server edition and Lubuntu would be suitable. Obviously Lubuntu would be best if you want some sort of X capability and it will have no trouble running on that amount of RAM.