apt-get一直说要上网，而我有一个很好的连接

Question

我需要检查一下是否有Ubuntu的更新。我想是12.04

正如你所看到的，它是这样说的：

Failed to download repository information  Check your Internet connection.

Details:

W:Failed to fetch cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)/dists/precise/main/binary-amd64/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)/dists/precise/restricted/binary-amd64/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)/dists/precise/main/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)/dists/precise/restricted/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/source/Sources  404  Not Found
, W:Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.

Answer 1

我建议你检查一下你的互联网连接。只需打开Firefox，看看您的起始页面是否加载。如果您没有连接到internet，请尝试连接到Wifi网络。如果您的计算机没有Wifi功能，或者缺乏必要的驱动程序，请将以太网线路插入计算机。

Answer 2

我遇到了这个问题，在将服务器从更新管理器(从我的国家更改到我们或主服务器)之后，它工作得很好。尝试一台靠近你的服务器或主服务器，看看它是否有效。

编辑:取消检查CD-ROM

Answer 3

你上网了吗？如果是这样并给出了错误，请尝试如下:尝试更改服务器--选择更新管理器、定义、从其中下载，然后选择一个更靠近您的服务器。然后再试着检查你的更新。