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 …apt ×1