1、认证上网。
没有网络连接的Ubuntu远不会像传说的那么强大，如果您的电脑不经常上网，红旗linux完整版绝对是首选，一个即使是 Ubuntu的dvd版也很难用。而许多单位或小区实行网络认证后，linux系统的上网却成了问题，下面就简单介绍一下ubuntu通过认证上网的方法。
1.1 下载：下载h3c802.1xClient for linux并解压。
下载h3c802.1xClient for linux，通常baidu一下就有了。
1.2 进行安装：进入被解压的文件夹，运行 sudo ./pre.ps。
1.3.1 试运行：sudo linux1x;结果可能显示缺少libstdc++-libc6.2-2.so.3这个库文件，这说明您系统里的库文件版本较高需要设置一番。
1.3.2 查看您系统里的库文件版本：cd /usr/lib；ls libstdc++*。我发现我的是libstdc++.so.6.0.13
1.3.3建立一个名为libstdc++-libc6.2-2.so.3的软连接指向libstdc++.so.6.0.13：sudo ln -s libstdc++.so.6.0.13 libstdc++-libc6.2-2.so.3
1.4配置：sudo linux1x -c;根据实际依次选定。
1.5再试运行：sudo linux1x –u username/password –n eth0 –d；现在如何？
1.6为linux1x增加其他用户运行权限：sudo chmod u+s /usr/local/bin/linux1x
1.7 设置开机自动认证：系统--首选项--启动应用程序--添加；“命令栏“填 “linux1x -d”其他随便。
1.8应该OK了。
2、网络代理设置
连上网不等于能看到你想看的内容，下面就介绍几种利用免费代理的方法访问你所要看的网站。
2.1前提
2.1.1为firefox安装autoproxy插件。安转后会发现在浏览器左下方出现一“福“字。（安装地址：addons.mozilla.org/zh-CN/firefox/addon/11009/）
2.1.2配置。单击“福“--代理服务器--选择代理服务器；这时候可选择您的代理服务器种类。
2.1.3如果用chrome，则用proxy switchy插件。
2.2利用免费ssh代理
2.2.1网上许多国外的免费代理，就我用的代理可到http://www.cjb.net/cgi-bin/shell.cgi?action=signup去注册一个账户。
2.2.2方法一：
2.2.2.1安装expect：sudo apt-get install expect
2.2.2.2写一个脚本随便命名，比如sshgfw，将下列内容粘贴进去：
set timeout 60
spawn /usr/bin/ssh -D 7070 -g user@shell.cjb.net
# 这里的 user 为你自己的用户名，shell.cjb.net 是我从上面网址申请的服务器域名
expect {
"password:" {
send "password\r"
#这里的 password 改为你自己的密码
}
}
interact {
timeout 60 { send " "}
}
2.2.2.3给此文件加执行权限：sudo chmod a+x sshgfw;将此文件拷入/usr/local/bin中；此时时执行sshgfw即可。
2.2.3方法二：
2.2.3.1安装putty：sudo apt-get install putty
2.2.3.2配置putty：session--hostname(or ip address)框填入shell.cjb.net（此处以我的为例）；在saved sessions中亦填入shell.cjb.net并点击save键；connection--ssh--tunnel,destination处点 dynamic选项，source port处填入7070并点add；此时点对话框下方的open输入用户名及密码即可实现代理。
2.2.3.3补充。当然，putty的功能远非如此，你可以登录这家提供代理服务的服务器，会发现其系统是freebsd8.0，你不妨学习一下这款据说是最稳定的服务器用类Unix系统。根据其说明你还可享有1G的空间。有趣的是我还发现和我一起的用户有五千多，很多用户名一看就是咱的同胞。
2.3利用“洋葱头“
2.3.1添加源：sudo deb http://deb.torproject.org/torproject.org <DISTRIBUTION> main，其中<DISTRIBUTION>表示你Ubuntu的版本号，如10.04应该为lucid；添加 gpg key：
sudo gpg --keyserver keys.gnupg.net --recv 886DDD89
sudo gpg --export A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 | sudo apt-key add -
2.3.2更新软件源并安装tor：
sudo apt-get update
sudo apt-get install tor tor-geoipdb
2.3.3运行apt-get安装polipo及vidalia
2.3.4配置polipo：将下列内容替换/etc/polipo/config 或~/.polipo
# Uncomment this if you want to use a parent SOCKS proxy:
socksParentProxy = "localhost:9050"
socksProxyType = socks5
### Memory
### ******
# Uncomment this if you want Polipo to use a ridiculously small amount
# of memory (a hundred C-64 worth or so):
# chunkHighMark = 819200
# objectHighMark = 128
# Uncomment this if you've got plenty of memory:
# chunkHighMark = 50331648
# objectHighMark = 16384
chunkHighMark = 67108864
### On-disk data
### ************
# Uncomment this if you want to disable the on-disk cache:
diskCacheRoot = ""
# Uncomment this if you want to put the on-disk cache in a
# non-standard location:
# diskCacheRoot = "~/.polipo-cache/"
# Uncomment this if you want to disable the local web server:
localDocumentRoot = ""
# Uncomment this if you want to enable the pages under /polipo/index?
# and /polipo/servers?. This is a serious privacy leak if your proxy
# is shared.
# disableIndexing = false
# disableServersList = false
disableLocalInterface = true
disableConfiguration = true
### Domain Name System
### ******************
# Uncomment this if you want to contact IPv4 hosts only (and make DNS
# queries somewhat faster):
#
# dnsQueryIPv6 = no
# Uncomment this if you want Polipo to prefer IPv4 to IPv6 for
# double-stack hosts:
#
# dnsQueryIPv6 = reluctantly
# Uncomment this to disable Polipo's DNS resolver and use the system's
# default resolver instead. If you do that, Polipo will freeze during
# every DNS query:
dnSUSEGethostbyname = yes
### HTTP
### ****
# Uncomment this if you want to enable detection of proxy loops.
# This will cause your hostname (or whatever you put into proxyName
# above) to be included in every request:
disableVia = true
# Uncomment this if you want to slightly reduce the amount of
# information that you leak about yourself:
# censoredHeaders = from, accept-language
# censorReferer = maybe
censoredHeaders = from,accept-language,x-pad,link
censorReferer = maybe
# Uncomment this if you're paranoid. This will break a lot of sites,
# though:
# censoredHeaders = set-cookie, cookie, cookie2, from, accept-language
# censorReferer = true
# Uncomment this if you want to use Poor Man's Multiplexing; increase
# the sizes if you're on a fast line. They should each amount to a few
# seconds' worth of transfer; if pmmSize is small, you'll want
# pmmFirstSize to be larger.
# Note that PMM is somewhat unreliable.
# pmmFirstSize = 16384
# pmmSize = 8192
# Uncomment this if your user-agent does something reasonable with
# Warning headers (most don't):
# relaxTransparency = maybe
# Uncomment this if you never want to revalidate instances for which
# data is available (this is not a good idea):
# relaxTransparency = yes
# Uncomment this if you have no network:
# proxyOffline = yes
# Uncomment this if you want to avoid revalidating instances with a
# Vary header (this is not a good idea):
# mindlesslyCacheVary = true
# Suggestions from Incognito configuration
maxConnectionAge = 5m
maxConnectionRequests = 120
serverMaxSlots = 8
serverSlots = 2
tunnelAllowedPorts = 1-65535
2.3.4-0重启polipo：sudo /etc/init.d/polipo restart
2.3.5运行vidalia：应用程序--互联网--vadalia，你可能会看到“Vidalia detected that the Tor software exited unexpectedly.
Please check the message log for recent warning or error messages.“这样的提示。这是因为tor已经启动不能再次启动的缘故，所以先将其关闭：sudo /etc/init.d/tor stop，然后再运行vidalia 就行了。
2.3.6补充：使用过tor的网友都知道安装tor后并不意味着就能自动实现代理，还需要进一步配置，鉴于本人比较懒散，在这里就不详解了，网上这样的文章很多。
2.3.7参考文章
http://www.torproject.org/docs/tor-doc-unix.html.en#polipo
http://www.torproject.org/docs/debian.html
3、利用NX-client for linux访问任意网站
3.1下载客户端：https://www.tusurfer.com/tus/downloads/nxclient/nxclient_3.4.0-7_i386.deb
3.2申请帐号：https://www.tusurfer.com/tus/registerUser.do；成功后到你邮箱离去找用户名及密码。
3.3配置及登录：应用程序--互联网--NX-client for linux；点击configure，在host栏填写remote.tusurfer.com,port栏填写443，点击ok返回；login处填你的注册名，password处填密码，session处填TUS without SSL TUnnel，点击login即可登录了。登录后你会发现其操作系统是suse，速度堪比蜗牛（有时还是挺快的）。
注：图片上传到红联Linux系统教程频道中。