Just Beginning
Introduction
Is Ubuntu for You?*
Which Ubuntu to pick?
Installing Ubuntu inside XP
Plan Partitions
Download and Burn Ubuntu
Burn ISO from Mac
Install Desktop CD Ubuntu
Install Alternate CD Ubuntu*
Modest Specs
Where's the Terminal?
Password in Terminal
Install Software
Extra Repositories*
File Permissions
Security in Ubuntu

Next Steps
Install Nvidia Drivers
Mount Windows
Install Proprietary Software
Install Flash
Install Java
Install MP3 Playback
Finding iTunes Alternatives
Export as MP3 in Audacity
Install New Firefox*
Use Wine

Beyond the Basics
Backing up Ubuntu
Upgrade Ubuntu*
Make a /home partition
Downgrade Firefox in 8.04
Install Internet Explorer
Mount Linux
Use PartImage

Playing Around
Enable Desktop Effects
KDE/Gnome Comparison
Install Gnome
Install KDE
Install XFCE
Install IceWM
Install XPDE
Pure Gnome
Pure KDE
Pure XFCE
A faster KDE
Replacing Nautilus

Troubleshooting
No graphical login
Can't sudo
Graphical sudo
Forgot password

* Off-site link

Getting Back to a Pure KDE on Ubuntu

If you used aptitude to install other desktop environments, you will not need this tutorial, as you can just type

sudo aptitude remove ubuntu-desktop
or
sudo aptitude remove xubuntu-desktop
to get back to your "pure KDE."

If you didn't have as much foresight and chose instead to install Gnome or XFCE through Adept or apt-get, this is how to remove those desktop environments from your KDE.

Note, this applies only to Ubuntu 8.04 (Hardy). If you're using Gutsy, go here. If you're using Feisty, go here. If you're using Edgy, go here. If you're using Dapper, go here.

Remove Ubuntu
Paste this command into the terminal:

sudo apt-get remove alacarte app-install-data-commercial apport-gtk apturl at-spi bluez-gnome brasero brltty-x11 bug-buddy capplets-data cli-common compiz compiz-core compiz-fusion-plugins-extra compiz-fusion-plugins-main compiz-gnome compiz-plugins compizconfig-backend-gconf contact-lookup-applet dbus-x11 dcraw deskbar-applet desktop-file-utils displayconfig-gtk diveintopython doc-base docbook-xml ekiga eog espeak espeak-data evince evolution evolution-common evolution-data-server evolution-data-server-common evolution-exchange evolution-plugins evolution-webcal example-content f-spot fast-user-switch-applet file-roller firefox firefox-3.0 firefox-3.0-gnome-support firefox-gnome-support gamin gcalctool gconf-editor gconf2 gconf2-common gdebi gdm gedit gedit-common gimp gimp-data gimp-gnomevfs gimp-python gksu gnome-about gnome-accessibility-themes gnome-app-install gnome-applets gnome-applets-data gnome-cards-data gnome-control-center gnome-desktop-data gnome-doc-utils gnome-games gnome-games-data gnome-icon-theme gnome-keyring gnome-mag gnome-media gnome-media-common gnome-menus gnome-mime-data gnome-mount gnome-netstatus-applet gnome-nettool gnome-orca gnome-panel gnome-panel-data gnome-pilot gnome-pilot-conduits gnome-power-manager gnome-screensaver gnome-session gnome-settings-daemon gnome-spell gnome-system-monitor gnome-system-tools gnome-terminal gnome-terminal-data gnome-themes gnome-user-guide gnome-utils gnome-volume-manager gstreamer0.10-alsa gstreamer0.10-gnomevfs gstreamer0.10-plugins-base gstreamer0.10-plugins-base-apps gstreamer0.10-plugins-good gstreamer0.10-pulseaudio gstreamer0.10-tools gstreamer0.10-x gtk2-engines gtk2-engines-murrine gtk2-engines-pixbuf gtk2-engines-ubuntulooks gtkhtml3.14 gucharmap guile-1.6-libs gvfs gvfs-backends gvfs-fuse human-icon-theme human-theme hwtest hwtest-gtk im-switch jockey-gtk language-selector libalut0 libarchive1 libart2.0-cil libatspi1.0-0 libavahi-glib1 libavahi-ui0 libavc1394-0 libbeagle1 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libcairo-perl libcairomm-1.0-1 libcamel1.2-11 libcdio-cdda0 libcdio-paranoia0 libcdio7 libcompizconfig0 libdecoration0 libdeskbar-tracker libdmx1 libdv4 libebook1.2-9 libecal1.2-7 libedata-book1.2-2 libedata-cal1.2-6 libedataserver1.2-9 libedataserverui1.2-8 libeel2-2 libeel2-data libegroupwise1.2-13 libenchant1c2a libespeak1 libexchange-storage1.2-3 libexempi3 libflickrnet2.1.5-cil libgail-common libgail-gnome-module libgail18 libgamin0 libgconf2-4 libgconf2.0-cil libgdata-google1.2-1 libgdata1.2-1 libggz2 libggzcore9 libggzmod4 libgimp2.0 libgksu2-0 libglade2-0 libglade2.0-cil libglew1.5 libglib-perl libglib2.0-cil libglibmm-2.4-1c2a libgmime-2.0-2 libgmime2.2-cil libgnome-desktop-2 libgnome-keyring0 libgnome-mag2 libgnome-media0 libgnome-menu2 libgnome-pilot2 libgnome-speech7 libgnome-vfs2.0-cil libgnome-window-settings1 libgnome2-0 libgnome2-canvas-perl libgnome2-common libgnome2-perl libgnome2-vfs-perl libgnome2.0-cil libgnomecanvas2-0 libgnomecanvas2-common libgnomecups1.0-1 libgnomekbd-common libgnomekbd2 libgnomekbdui2 libgnomeprint2.2-0 libgnomeprint2.2-data libgnomeprintui2.2-0 libgnomeprintui2.2-common libgnomeui-0 libgnomeui-common libgnomevfs2-0 libgnomevfs2-bin libgnomevfs2-common libgnomevfs2-extra libgpod3 libgtk-vnc-1.0-0 libgtk2-perl libgtk2.0-bin libgtk2.0-cil libgtkhtml2-0 libgtkhtml3.14-19 libgtkhtml3.16-cil libgtkmm-2.4-1c2a libgtksourceview-common libgtksourceview1.0-0 libgtksourceview2.0-0 libgtksourceview2.0-common libgtkspell0 libgtop2-7 libgtop2-common libgucharmap6 libguile-ltdl-1 libgvfscommon0 libgweather-common libgweather1 libhesiod0 libidl0 libiec61883-0 libkpathsea4 liblaunchpad-integration1 liblircclient0 liblpint-bonobo0 libmetacity0 libmono-addins-gui0.2-cil libmono-addins0.2-cil libmono-cairo1.0-cil libmono-corlib1.0-cil libmono-corlib2.0-cil libmono-data-tds1.0-cil libmono-data-tds2.0-cil libmono-security1.0-cil libmono-security2.0-cil libmono-sharpzip0.84-cil libmono-sharpzip2.84-cil libmono-sqlite2.0-cil libmono-system-data1.0-cil libmono-system-data2.0-cil libmono-system-web1.0-cil libmono-system-web2.0-cil libmono-system1.0-cil libmono-system2.0-cil libmono0 libmono1.0-cil libmono2.0-cil libnautilus-burn4 libnautilus-extension1 libndesk-dbus-glib1.0-cil libndesk-dbus1.0-cil libnet-dbus-perl libnm-glib0 libnotify1 liboil0.3 liboobs-1-4 libopal-2.2 libopenal0a liborbit2 libotr2 libpam-gnome-keyring libpanel-applet2-0 libpisock9 libpisync1 libpolkit-gnome0 libpoppler-glib2 libportaudio0 libpt-1.10.10 libpt-1.10.10-plugins-alsa libpt-1.10.10-plugins-v4l libpt-1.10.10-plugins-v4l2 libpulse-browse0 libpulsecore5 libpurple0 libqthreads-12 librarian0 librsvg2-common libscrollkeeper0 libsexy2 libshout3 libsndfile1 libsoup2.4-1 libsqlite0 libstartup-notification0 libtotem-plparser10 libtracker-gtk0 libtrackerclient0 libvte-common libvte9 libwnck-common libwnck22 libx11-xcb1 libxevie1 libxklavier12 libxml-twig-perl libxml2-utils libxres1 libzephyr3 mesa-utils metacity metacity-common mono-common mono-gac mono-jit mono-runtime mousetweaks nautilus nautilus-cd-burner nautilus-data nautilus-sendto nautilus-share network-manager-gnome notification-daemon o3read obex-data-server onboard openoffice.org-gnome openoffice.org-gtk pidgin pidgin-data pidgin-otr pkg-config policykit-gnome pulseaudio pulseaudio-esound-compat pulseaudio-module-gconf pulseaudio-module-hal pulseaudio-module-x11 pulseaudio-utils python-brlapi python-cairo python-gconf python-gdata python-glade2 python-gmenu python-gnome2 python-gnome2-desktop python-gnomecanvas python-gst0.10 python-gtk2 python-gtkhtml2 python-gtksourceview2 python-launchpad-integration python-notify python-numeric python-pyatspi python-pyorbit python-sexy python-virtkey python-vte rhythmbox rss-glx scim scim-bridge-client-gtk scim-gtk2-immodule screensaver-default-images scrollkeeper seahorse sgml-base sgml-data shared-mime-info software-properties-gtk sound-juicer sqlite sqlite3 ssh-askpass-gnome synaptic system-config-printer-gnome system-tools-backends tangerine-icon-theme tomboy totem totem-common totem-gstreamer totem-mozilla totem-plugins tracker tracker-search-tool transmission-common transmission-gtk tsclient ubufox ubuntu-artwork ubuntu-desktop ubuntu-docs ubuntu-gdm-themes ubuntu-sounds ubuntu-wallpapers update-manager update-notifier usplash-theme-ubuntu vinagre vino whois xdg-user-dirs-gtk xml-core xsane xsane-common xscreensaver-data xscreensaver-gl xsltproc xulrunner-1.9 xulrunner-1.9-gnome-support yelp zenity && sudo apt-get install kubuntu-desktop

Remove Xubuntu
Paste this command into the terminal:

sudo apt-get remove a2ps abiword abiword-common abiword-plugins app-install-data-commercial apport-gtk apturl brasero dbus-x11 desktop-file-utils displayconfig-gtk doc-base docbook-xml evince-gtk file-roller firefox firefox-3.0 gamin gcalctool gconf2 gconf2-common gdebi gdm gimp gimp-data gksu gnome-accessibility-themes gnome-app-install gnome-cards-data gnome-games gnome-games-data gnome-icon-theme gnome-keyring gnome-media-common gnome-mime-data gnome-mount gnome-power-manager gnome-screensaver gnome-system-monitor gnome-system-tools gnumeric-common gnumeric-gtk gstreamer0.10-alsa gstreamer0.10-gnomevfs gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-x gtk2-engines gtk2-engines-murrine gtk2-engines-pixbuf gtk2-engines-ubuntulooks gtk2-engines-xfce gucharmap guile-1.6-libs human-icon-theme human-theme im-switch imagemagick jockey-gtk language-selector libaiksaurus-1.2-0c2a libaiksaurus-1.2-data libaiksaurusgtk-1.2-0c2a libavahi-glib1 libavahi-ui0 libavc1394-0 libbeagle1 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libcairo-perl libcairomm-1.0-1 libcamel1.2-11 libcdio7 libdmx1 libdv4 libebook1.2-9 libecal1.2-7 libedataserver1.2-9 libenchant1c2a libexo-0.3-0 libgail-common libgail18 libgamin0 libgconf2-4 libgdome2-0 libgdome2-cpp-smart0c2a libggz2 libggzcore9 libggzmod4 libgimp2.0 libgksu2-0 libglade2-0 libglib-perl libglib2.0-data libglibmm-2.4-1c2a libgnome-desktop-2 libgnome-keyring0 libgnome-media0 libgnome-menu2 libgnome2-0 libgnome2-canvas-perl libgnome2-common libgnome2-perl libgnome2-vfs-perl libgnomecanvas2-0 libgnomecanvas2-common libgnomecups1.0-1 libgnomekbd-common libgnomekbd2 libgnomekbdui2 libgnomeprint2.2-0 libgnomeprint2.2-data libgnomeprintui2.2-0 libgnomeprintui2.2-common libgnomeui-0 libgnomeui-common libgnomevfs2-0 libgnomevfs2-common libgoffice-0-6 libgoffice-0-6-common libgsf-gnome-1-114 libgtk-vnc-1.0-0 libgtk2-perl libgtk2.0-bin libgtkhtml2-0 libgtkmathview0c2a libgtkmm-2.4-1c2a libgtksourceview-common libgtksourceview1.0-0 libgtkspell0 libgtop2-7 libgtop2-common libgucharmap6 libguile-ltdl-1 libhesiod0 libidl0 libiec61883-0 libkpathsea4 liblaunchpad-integration1 liblink-grammar4 liblircclient0 libmetacity0 libnautilus-burn4 libnautilus-extension1 libnet-dbus-perl libnm-glib0 libnotify1 liboil0.3 liboobs-1-4 liborbit2 libotr2 libots0 libpanel-applet2-0 libpolkit-gnome0 libpoppler-glib2 libpurple0 libqthreads-12 librsvg2-common libscrollkeeper0 libsexy2 libshout3 libstartup-notification0 libt1-5 libtagc0 libthunar-vfs-1-2 libtotem-plparser10 libtrackerclient0 libvte-common libvte9 libwnck-common libwnck22 libwpd-stream8c2a libxfce4mcs-client3 libxfce4mcs-manager3 libxfce4util4 libxfcegui4-4 libxklavier12 libxml-twig-perl libxres1 libzephyr3 link-grammar-dictionaries-en metacity-common mousepad mozilla-thunderbird network-manager-gnome notification-daemon onboard orage pidgin pidgin-data pidgin-otr policykit-gnome python-cairo python-exo python-gconf python-gdata python-glade2 python-gnome2 python-gnome2-desktop python-gnomecanvas python-gst0.10 python-gtk2 python-gtkhtml2 python-launchpad-integration python-notify python-numeric python-pyorbit python-sexy python-virtkey python-vte ristretto scim scim-gtk2-immodule scim-modules-table scim-tables-additional screensaver-default-images scrollkeeper sgml-base sgml-data shared-mime-info software-properties-gtk synaptic system-config-printer-gnome system-tools-backends tango-icon-theme tango-icon-theme-common thunar thunar-archive-plugin thunar-data thunar-media-tags-plugin thunar-thumbnailers thunar-volman thunderbird totem totem-common totem-gstreamer totem-plugins transmission-common transmission-gtk ubufox ubuntu-artwork ubuntu-gdm-themes ubuntu-wallpapers update-manager update-notifier vim-runtime vinagre xfce4-appfinder xfce4-battery-plugin xfce4-clipman-plugin xfce4-cpugraph-plugin xfce4-dict-plugin xfce4-fsguard-plugin xfce4-governor-plugin xfce4-icon-theme xfce4-mailwatch-plugin xfce4-mcs-manager xfce4-mcs-plugins xfce4-mcs-plugins-extra xfce4-mixer xfce4-mixer-alsa xfce4-mount-plugin xfce4-netload-plugin xfce4-notes-plugin xfce4-panel xfce4-places-plugin xfce4-quicklauncher-plugin xfce4-screenshooter-plugin xfce4-session xfce4-smartbookmark-plugin xfce4-systemload-plugin xfce4-terminal xfce4-utils xfce4-verve-plugin xfce4-weather-plugin xfce4-xkb-plugin xfdesktop4 xfdesktop4-data xfprint4 xfwm4 xfwm4-themes xml-core xscreensaver-data xscreensaver-gl xubuntu-artwork-usplash xubuntu-default-settings xubuntu-desktop xubuntu-docs xulrunner-1.9 zenity && sudo apt-get install kubuntu-desktop