Ubuntu下的网页flash插件的安装

yelin@yelin-desktop:~$ sudo apt-get install flashplugin-nonfree
Password:
正在读取软件包列表... 完成
正在分析软件包的依赖关系树     
读取状态信息... 完成           
建议安装的软件包：
konqueror-nsplugins msttcorefonts ttf-xfree86-nonfree xfs
下列【新】软件包将被安装：
flashplugin-nonfree
共升级了 0 个软件包，新安装了 1 个软件包，要卸载 0 个软件包，有 0 个软件未被升级。
需要下载 15.4kB 的软件包。
解压缩后会消耗掉 111kB 的额外空间。
获取：1 http://debian.linux.org.tw feisty/multiverse flashplugin-nonfree 9.0.31.0.2ubuntu1 [15.4kB]
下载 15.4kB，耗时 0s (40.2kB/s)          
正在预设定软件包 ...
选中了曾被取消选择的软件包 flashplugin-nonfree。
(正在读取数据库 ... 系统当前总共安装有 108700 个文件和目录。)
正在解压缩 flashplugin-nonfree (从 .../flashplugin-nonfree_9.0.31.0.2ubuntu1_i386.deb) ...
正在设置 flashplugin-nonfree (9.0.31.0.2ubuntu1) ...
Downloading...
--13:56:07-- http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_9_linux.tar.gz
           => `./install_flash_player_9_linux.tar.gz'
正在解析主机 fpdownload.macromedia.com... 72.246.90.70
正在连接 fpdownload.macromedia.com|72.246.90.70|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度： 2,608,602 (2.5M) [application/x-gzip]

     0K .......... .......... .......... .......... .......... 1%   17.75 KB/s
   50K .......... .......... .......... .......... .......... 3%   14.77 KB/s
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   150K .......... .......... .......... .......... .......... 7%   12.66 KB/s
   200K .......... .......... .......... .......... .......... 9%   17.75 KB/s
   250K .......... .......... .......... .......... .......... 11%   16.10 KB/s
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1450K .......... .......... .......... .......... .......... 58%   11.84 KB/s
1500K .......... .......... .......... .......... .......... 60%   12.06 KB/s
1550K .......... .......... .......... .......... .......... 62%    8.87 KB/s
1600K .......... .......... .......... .......... .......... 64%   14.78 KB/s
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1750K .......... .......... .......... .......... .......... 70%   10.43 KB/s
1800K .......... .......... .......... .......... .......... 72%   10.96 KB/s
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1900K .......... .......... .......... .......... .......... 76%    9.14 KB/s
1950K .......... .......... .......... .......... .......... 78%   20.32 KB/s
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2100K .......... .......... .......... .......... .......... 84%   11.09 KB/s
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2500K .......... .......... .......... .......... .......   100%   15.32 KB/s

13:59:35 (12.28 KB/s) - `./install_flash_player_9_linux.tar.gz' saved [2608602/2608602]

Download done.
md5sum mismatch install_flash_player_9_linux.tar.gz
The Flash plugin is NOT installed.

zhancang@zhancang:~$