更新问题

让我提前感谢你阅读并试图帮助我。 谢谢！ 对不起，可怕的编辑也不得不改变一些链接，因为我不信誉:)

我的问题是这样的：打开更新软件中心出现一个错误窗口，说：“在修复软件包目录之前，无法安装或删除项目……”我单击修复但它失败了。

运行sudo apt-get update失败这是错误报告：

"W: Failed to fetch archive.ubuntu.com/ubuntu/dists/precise/Release Unable to find expected entry 'restricted/source/Sources' in Release file (Wrong sources.list entry or malformed file) W: Failed to fetch bzip2:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_precise-updates_main_binary-i386_Packages Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead." 

source.list的内容：

 # deb cdrom:[Lubuntu 12.04 _Precise Pangolin_ - Release i386 (20120423)]/ precise main multiverse restricted universe # See help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb us.archive.ubuntu.com/ubuntu/ precise main restricted deb-src us.archive.ubuntu.com/ubuntu/ precise main restricted ## Major bug fix updates produced after the final release of the ## distribution. ## NB software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb us.archive.ubuntu.com/ubuntu/ precise universe deb-src us.archive.ubuntu.com/ubuntu/ precise universe ## NB software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb us.archive.ubuntu.com/ubuntu/ precise multiverse deb-src us.archive.ubuntu.com/ubuntu/ precise multiverse ## NB software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb archive.canonical.com/ubuntu precise partner # deb-src archive.canonical.com/ubuntu precise partner ## This software is not part of Ubuntu, but is offered by third-party ## developers who want to ship their latest software. deb extras.ubuntu.com/ubuntu precise main deb us.archive.ubuntu.com/ubuntu/ precise-updates restricted main multiverse universe deb-src extras.ubuntu.com/ubuntu precise main" 

我尝试过：阅读喜欢的其他答案并做他们建议的事情：

1.更改我使用的服务器

2。

  sudo apt-get autoclean sudo apt-get autoremove sudo apt-get -f install 

3.以下内容也不起作用：

  cd /var/lib/apt sudo mv lists lists.old sudo mkdir -p lists/partial 

帮帮我问一下，你唯一的希望！ 再次感谢