当我打开“删除于添加”时，老是会出现下面的情况：他弹出一个窗口，显示下面这些内容：
检查已安装的和可用的应用程序失败
This is a major failure of your software management system. Please check for broken packages with synaptic, check the file permissions and correctness of the file '/etc/apt/sources.list' and reload the software information with: 'sudo apt-get update' and 'sudo apt-get install -f'.
当我按照他的提示输入：sudo apt-get update 时就会出现这样：
……………………………………
无法连接上 security.ubuntu.com:80 (82.211.81.138)，连接超时
99% [正在连接 security.ubuntu.com (82.211.81.138)]
_________________（虽然我改了很多源还是那样）
当我输入他的提示：sudo apt-get install -f就会这样：
………………
命中 http://archive.ubuntu.com dapper-backports/restricted Packages
命中 http://archive.ubuntu.com dapper-backports/universe Packages
获取：10 http://archive.canonical.com dapper-commercial Release.gpg [191B]
忽略 http://archive.canonical.com dapper-commercial/maindeb Translation-zh_CN
命中 http://archive.ubuntu.com dapper-backports/multiverse Packages
忽略 http://archive.canonical.com dapper-commercial/http://ubuntu.cn99.com/ubuntu/ Translation-zh_CN
忽略 http://archive.canonical.com dapper-commercial/dapper Translation-zh_CN
忽略 http://archive.canonical.com dapper-commercial/main Translation-zh_CN
忽略 http://archive.canonical.com dapper-commercial/restricted Translation-zh_CN
忽略 http://archive.canonical.com dapper-commercial/universe Translation-zh_CN
忽略 http://archive.canonical.com dapper-commercial/multiverse Translation-zh_CN
命中 http://archive.canonical.com dapper-commercial Release
错误 http://security.ubuntu.com feisty-security Release.gpg
无法连接上 security.ubuntu.com:80 (82.211.81.138)，连接超时
错误 http://security.ubuntu.com feisty-security/main Translation-zh_CN
无法连接上 security.ubuntu.com:80 (82.211.81.138)，连接超时
99% [正在连接 security.ubuntu.com (82.211.81.138)]
ubuntu@ubuntu-desktop:~$ sudo apt-get install -f
……………………………………
正在读取软件包列表... 有错误!
E: Dynamic MMap ran out of room
E: Dynamic MMap ran out of room
E: 处理 trackballs-dbg (NewVersion1)时出错
E: Problem with MergeList /var/lib/apt/lists/cn.archive.ubuntu.com_ubuntu_dists_feisty_universe_binary-i386_Packages
E: 无法解析或打开软件包的列表或是状态文件。
请问该怎么解决阿？？？？？？？
新手求教 help ！！！！！
