我刚刚安装了 Ubuntu Gnome 16.04。我告诉它保存我的文件 - 有效。有些软件必须重新安装。现在，当我运行时，sudo apt-get update我看到：
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:33 and /etc/apt/sources.list:87
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:33 and /etc/apt/sources.list:87
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:33 and /etc/apt/sources.list:87
W: Target Translations (main/i18n/Translation-en_GB) is configured multiple times in /etc/apt/sources.list:33 and /etc/apt/sources.list:87
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:33 and /etc/apt/sources.list:87
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:33 …我有 Ubuntu 16.04 Xenial Xerus，当我想运行sudo apt-get updateorsudo apt-get autoclean或sudo apt-get install (package name)or 时sudo apt-get install -f，我收到以下消息：
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W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:5
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:2 …apt ×2