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今天在ubuntu上更新库(apt update)的时候遇到了报错：
-> # apt update
Hit:1 http://mirrors.zju.edu.cn/ubuntu bionic InRelease
Hit:2 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease
Hit:3 http://mirrors.zju.edu.cn/ubuntu bionic-security InRelease
Hit:4 http://mirrors.zju.edu.cn/ubuntu bionic-updates InRelease
Hit:5 http://mirrors.zju.edu.cn/ubuntu bionic-backports InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
37 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/kubernetes.list:1 and /etc/apt/sources.list.d/kubernetes.list:2
报错W: Target CNF (main/cnf/Commands-all) is configured multiple times in和W: Target Packages (main/binary-amd64/Packages) is configured multiple times in看起来像更新源重复配置了。
根据提示，查看文件/etc/apt/sources.list.d/kubernetes.list：
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
同一个更新源被配置了2次，删掉一个就行了。
更多内容可以参考这个问答：How can I fix apt error “W: Target Packages … is configured multiple times”? - Ask Ubuntu
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