在用xrandr设置双屏幕扩展显示的时候，有可能会提示下面的错误:
该错误说明Xorg的虚拟桌面不够大，可以通过使用Xorg.conf的Virtual指令更改虚拟桌面的大小。例如:
Section "ServerLayout" Identifier "Xorg Configured" Screen 0 "Primary Screen" 0 0EndSectionSection "Monitor" Identifier "Primary Monitor" Modeline "1400x900" 104.23 1400 1480 1632 1864 900 901 904 932 -HSync +VsyncEndSectionSection "Screen" Identifier "Primary Screen" Monitor "Primary Monitor" DefaultColorDepth 24 SubSection "Display" Depth 24 Modes "1400x900" "1024x768" Virtual 3120 1050 EndSubSectionEndSectionSection "DRI" Mode 0666EndSection#Ubuntu 11.10切换中文目录为英文目录
export LANG=en_US
xdg-user-dirs-gtk-update
选 update
export LANG=zh_CN.UTF-8
xdg-user-dirs-gtk-update
选“不要再提醒”和“保持原来的名称”
#Ubuntu自带的VIM不完整，需要升级
sudo apt-get install -y vim
vi ~/.vimrc
set shiftwidth=4
set tabstop=8
set autoindent
set expandtab
set softtabstop=4
imap
set pastetoggle=
#更新Java / firefox
sudo add-apt-repository "deb http://archive.canonical.com lucid partner"
sudo add-apt-repository ppa:mozillateam/firefox-next
sudo add-apt-repository ppa:ubuntu-wine/ppa
sudo apt-get update
sudo apt-get install firefox sun-java6-bin wine
#Adobe Flash Player火狐插件flash x64 firefox Ubuntu Linux x64
sudo apt-get install adobe-flashplugin