问题描述
我最近在Ubuntu 12.10 32位系统上安装了ubuntu-gnome-desktop。一切正常，但是现在我想再次删除它，因为我更喜欢Unity。这包括撤消所有更改，例如使GRUB返回紫色背景并具有原始的Unity登录屏幕。
谢谢！
最佳办法
安装其他桌面环境的坏处是它们会安装许多额外的程序包，有时很难找到并删除所有这些程序包。
首先运行以下命令：
sudo apt-get purge abiword abiword-common abiword-plugin-grammar abiword-plugin-mathview alacarte argyll cups-pk-helper epiphany-browser epiphany-browser-data evolution evolution-common evolution-plugins fonts-cantarell fonts-lyx gdm gir1.2-accountsservice-1.0 gir1.2-caribou-1.0 gir1.2-clutter-gst-2.0 gir1.2-evince-3.0 gir1.2-gck-1 gir1.2-gconf-2.0 gir1.2-gcr-3 gir1.2-gdesktopenums-3.0 gir1.2-gkbd-3.0 gir1.2-gnomedesktop-3.0 gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0 gir1.2-ibus-1.0 gir1.2-mutter-3.0 gir1.2-networkmanager-1.0 gir1.2-panelapplet-4.0 gir1.2-polkit-1.0 gir1.2-telepathyglib-0.12 gir1.2-telepathylogger-0.2 gir1.2-upowerglib-1.0 gir1.2-xkl-1.0 gjs glchess glines gnect gnibbles gnobots2 gnome-applets gnome-applets-data gnome-color-manager gnome-desktop-data gnome-dictionary gnome-games gnome-games-extra-data gnome-icon-theme-extras gnome-mahjongg gnome-packagekit gnome-packagekit-data gnome-panel gnome-panel-data gnome-search-tool gnome-session-fallback gnome-shell gnome-shell-common gnome-software-manager gnome-sushi gnome-tweak-tool gnome-update-viewer gnotravex gnotski gnumeric gnumeric-common gnumeric-doc gstreamer1.0-alsa gstreamer1.0-plugins-base-apps gstreamer1.0-pulseaudio gstreamer1.0-tools gtali iagno itstool libabiword-2.9 libaudit0 libcaribou-common libcaribou0 libcolamd2.7.1 libcolord-gtk1 libedataserverui-3.0-4 libevolution libgdict-1.0-6 libgdict-common libgdome2-0 libgdome2-cpp-smart0c2a libgjs0c libgoffice-0.8-8 libgoffice-0.8-8-common libgtkmathview0c2a libicc2 libimdi0 libiptcdata0 liblink-grammar4 libloudmouth1-0 libmail-spf-perl libmozjs185-1.0 libmutter0 libnetaddr-ip-perl libots0 libpst4 libtidy-0.99-0 libtracker-extract-0.14-0 libtracker-miner-0.14-0 libtracker-sparql-0.14-0 libwv-1.2-4 libytnef0 lightsoff link-grammar-dictionaries-en mutter mutter-common packagekit packagekit-backend-aptcc packagekit-tools plymouth-theme-ubuntu-gnome-logo plymouth-theme-ubuntu-gnome-text python-cloudfiles python-packagekit quadrapassel re2c simple-scan spamassassin spamc swell-foop tracker tracker-extract tracker-gui tracker-miner-fs tracker-utils ubuntu-gnome-default-settings ubuntu-gnome-desktop xsltproc yelp-tools
它将清除您安装的大多数额外软件包。
然后运行sudo apt-get autoremove删除系统上不再需要的其他程序包和依赖项。
您可能(或可能不会，取决于是否已删除gdm)需要使用以下命令将您的登录屏幕更改回Unity的默认运行(即lightDM)
sudo dpkg-reconfigure gdm
在提示符下按Enter，然后从选项中选择lightdm。之后，您可以使用以下命令清除gdm
sudo apt-get purge gdm
最后运行：
sudo apt-get install --reinstall ubuntu-desktop
万一删除gnome抢占了主桌面的任何部分。
次佳办法
此答案基于Seth’s answer，旨在解决我在尝试执行他的第一个命令时在计算机上遇到的一个小问题(Ubuntu 14.04)：
sudo apt-get purge abiword abiword-common abiword-plugin-grammar abiword-plugin-mathview alacarte argyll cups-pk-helper epiphany-browser epiphany-browser-data evolution evolution-common evolution-plugins fonts-cantarell fonts-lyx gdm gir1.2-accountsservice-1.0 gir1.2-caribou-1.0 gir1.2-clutter-gst-2.0 gir1.2-evince-3.0 gir1.2-gck-1 gir1.2-gconf-2.0 gir1.2-gcr-3 gir1.2-gdesktopenums-3.0 gir1.2-gkbd-3.0 gir1.2-gnomedesktop-3.0 gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0 gir1.2-ibus-1.0 gir1.2-mutter-3.0 gir1.2-networkmanager-1.0 gir1.2-panelapplet-4.0 gir1.2-polkit-1.0 gir1.2-telepathyglib-0.12 gir1.2-telepathylogger-0.2 gir1.2-upowerglib-1.0 gir1.2-xkl-1.0 gjs glchess glines gnect gnibbles gnobots2 gnome-applets gnome-applets-data gnome-color-manager gnome-desktop-data gnome-dictionary gnome-games gnome-games-extra-data gnome-icon-theme-extras gnome-mahjongg gnome-packagekit gnome-packagekit-data gnome-panel gnome-panel-data gnome-search-tool gnome-session-fallback gnome-shell gnome-shell-common gnome-software-manager gnome-sushi gnome-tweak-tool gnome-update-viewer gnotravex gnotski gnumeric gnumeric-common gnumeric-doc gstreamer1.0-alsa gstreamer1.0-plugins-base-apps gstreamer1.0-pulseaudio gstreamer1.0-tools gtali iagno itstool libabiword-2.9 libaudit0 libcaribou-common libcaribou0 libcolamd2.7.1 libcolord-gtk1 libedataserverui-3.0-4 libevolution libgdict-1.0-6 libgdict-common libgdome2-0 libgdome2-cpp-smart0c2a libgjs0c libgoffice-0.8-8 libgoffice-0.8-8-common libgtkmathview0c2a libicc2 libimdi0 libiptcdata0 liblink-grammar4 libloudmouth1-0 libmail-spf-perl libmozjs185-1.0 libmutter0 libnetaddr-ip-perl libots0 libpst4 libtidy-0.99-0 libtracker-extract-0.14-0 libtracker-miner-0.14-0 libtracker-sparql-0.14-0 libwv-1.2-4 libytnef0 lightsoff link-grammar-dictionaries-en mutter mutter-common packagekit packagekit-backend-aptcc packagekit-tools plymouth-theme-ubuntu-gnome-logo plymouth-theme-ubuntu-gnome-text python-cloudfiles python-packagekit quadrapassel re2c simple-scan spamassassin spamc swell-foop tracker tracker-extract tracker-gui tracker-miner-fs tracker-utils ubuntu-gnome-default-settings ubuntu-gnome-desktop xsltproc yelp-tools
对我来说，由于某种原因，apt-get看到一些软件包不存在，只是退出了。因此，通过执行以下操作，我一步一步地清除了所有软件包：
for i in abiword abiword-common abiword-plugin-grammar abiword-plugin-mathview alacarte argyll cups-pk-helper epiphany-browser epiphany-browser-data evolution evolution-common evolution-plugins fonts-cantarell fonts-lyx gdm gir1.2-accountsservice-1.0 gir1.2-caribou-1.0 gir1.2-clutter-gst-2.0 gir1.2-evince-3.0 gir1.2-gck-1 gir1.2-gconf-2.0 gir1.2-gcr-3 gir1.2-gdesktopenums-3.0 gir1.2-gkbd-3.0 gir1.2-gnomedesktop-3.0 gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0 gir1.2-ibus-1.0 gir1.2-mutter-3.0 gir1.2-networkmanager-1.0 gir1.2-panelapplet-4.0 gir1.2-polkit-1.0 gir1.2-telepathyglib-0.12 gir1.2-telepathylogger-0.2 gir1.2-upowerglib-1.0 gir1.2-xkl-1.0 gjs glchess glines gnect gnibbles gnobots2 gnome-applets gnome-applets-data gnome-color-manager gnome-desktop-data gnome-dictionary gnome-games gnome-games-extra-data gnome-icon-theme-extras gnome-mahjongg gnome-packagekit gnome-packagekit-data gnome-panel gnome-panel-data gnome-search-tool gnome-session-fallback gnome-shell gnome-shell-common gnome-software-manager gnome-sushi gnome-tweak-tool gnome-update-viewer gnotravex gnotski gnumeric gnumeric-common gnumeric-doc gstreamer1.0-alsa gstreamer1.0-plugins-base-apps gstreamer1.0-pulseaudio gstreamer1.0-tools gtali iagno itstool libabiword-2.9 libaudit0 libcaribou-common libcaribou0 libcolamd2.7.1 libcolord-gtk1 libedataserverui-3.0-4 libevolution libgdict-1.0-6 libgdict-common libgdome2-0 libgdome2-cpp-smart0c2a libgjs0c libgoffice-0.8-8 libgoffice-0.8-8-common libgtkmathview0c2a libicc2 libimdi0 libiptcdata0 liblink-grammar4 libloudmouth1-0 libmail-spf-perl libmozjs185-1.0 libmutter0 libnetaddr-ip-perl libots0 libpst4 libtidy-0.99-0 libtracker-extract-0.14-0 libtracker-miner-0.14-0 libtracker-sparql-0.14-0 libwv-1.2-4 libytnef0 lightsoff link-grammar-dictionaries-en mutter mutter-common packagekit packagekit-backend-aptcc packagekit-tools plymouth-theme-ubuntu-gnome-logo plymouth-theme-ubuntu-gnome-text python-cloudfiles python-packagekit quadrapassel re2c simple-scan spamassassin spamc swell-foop tracker tracker-extract tracker-gui tracker-miner-fs tracker-utils ubuntu-gnome-default-settings ubuntu-gnome-desktop xsltproc yelp-tools; do sudo apt-get -y purge $i; done
完成上述操作后，请遵循Seth的其余说明。
希望一切完成后，您将获得gnome-shell-free桌面！
更新：我可以确认Seth的过程(主要)在我的Ubuntu 14.04上可以正常工作。 Gnome行为仍然有少量残留，但是可以容忍。