sudo apt-get update 出现packages 404 NOTFOUND

ubuntu18.04运行sudo apt-get update
报错：

更换/etc/apt中sources.list中的内容为

deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted

deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted

deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic universe
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates universe

deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic multiverse
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates multiverse

deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security universe
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security multiverse
deb [arch=amd64,i386]  http://archive.ubuntu.com/ubuntu bionic universe

最后

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