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无法执行 sudo apt-get update

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无法执行 sudo apt-get update

我是 Ubuntu 新手，当我执行

sudo apt-get update

我收到以下错误和警告

W: GPG error: http://ppa.launchpad.net quantal Release: The following
 signatures couldn't be verified because the public key is not
 available: NO_PUBKEY 5A9A06AEF9CB8DB0 W: Failed to fetch
 http://security.ubuntu.com/ubuntu/dists/quantal-security/Release.gpg 
 Something wicked happened resolving 'security.ubuntu.com:http' (-5 -
 No address associated with hostname)

 W: Failed to fetch
 http://extras.ubuntu.com/ubuntu/dists/quantal/Release.gpg  Something
 wicked happened resolving 'extras.ubuntu.com:http' (-5 - No address
 associated with hostname)

 W: Failed to fetch
 http://packages.medibuntu.org/dists/quantal/Release.gpg  Something
 wicked happened resolving 'packages.medibuntu.org:http' (-5 - No
 address associated with hostname)

 E: Some index files failed to download. They have been ignored, or old
 ones used instead.

谁能告诉我出了什么问题？

答案1

对于带有签名的错误：

sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 5A9A06AEF9CB8DB0
sudo gpg --armor --export 5A9A06AEF9CB8DB0 | sudo apt-key add -

然后，sudo apt-get update sudo apt-get upgrade

您需要这样做的原因是，您在 sources.list 中添加了 PPA，但是不信任它用于签署软件包的密钥。

答案2

根据http://forums.linuxmint.com/viewtopic.php?f=90&t=147271medibuntu 团队已宣布退出。只需进入“软件源”>“其他软件”并取消选中“http://packages.medibuntu.org/“

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