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					#!/bin/bash
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					if type "tee" 2>/dev/null && [ -n "$1" ]; then
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					    SOURCE_PATH="/etc/apt/sources.list"
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					    cp ${SOURCE_PATH} ${SOURCE_PATH}.bak && rm -rf ${SOURCE_PATH}
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					    case "$1" in
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					        "aliyun")
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					            tee ${SOURCE_PATH} <<-'EOF'
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					deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
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					deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
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					deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
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					deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
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					deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
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					deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
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					deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
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					deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
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					deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
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					deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
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					EOF
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					;;
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					        "zju")
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					            tee ${SOURCE_PATH} <<-'EOF'
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					deb http://mirrors.zju.edu.cn/ubuntu/ bionic main multiverse restricted universe
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					deb http://mirrors.zju.edu.cn/ubuntu/ bionic-backports main multiverse restricted universe
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					deb http://mirrors.zju.edu.cn/ubuntu/ bionic-proposed main multiverse restricted universe
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					deb http://mirrors.zju.edu.cn/ubuntu/ bionic-security main multiverse restricted universe
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					deb http://mirrors.zju.edu.cn/ubuntu/ bionic-updates main multiverse restricted universe
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					deb-src http://mirrors.zju.edu.cn/ubuntu/ bionic main multiverse restricted universe
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					deb-src http://mirrors.zju.edu.cn/ubuntu/ bionic-backports main multiverse restricted universe
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					deb-src http://mirrors.zju.edu.cn/ubuntu/ bionic-proposed main multiverse restricted universe
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					deb-src http://mirrors.zju.edu.cn/ubuntu/ bionic-security main multiverse restricted universe
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					deb-src http://mirrors.zju.edu.cn/ubuntu/ bionic-updates main multiverse restricted universe
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					EOF
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					;;
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					        "tsinghua")
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					            tee ${SOURCE_PATH} <<-'EOF'
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					deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
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					deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
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					deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
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					deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
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					deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
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					deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
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					deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
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					deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
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					deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
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					deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
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					EOF
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					;;
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					        "163")
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					            tee ${SOURCE_PATH} <<-'EOF'
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					deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
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					deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
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					deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
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					deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
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					deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
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					deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
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					deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
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					deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
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					deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
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					deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
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					EOF
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					;;
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					        "ustc")
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					            tee ${SOURCE_PATH} <<-'EOF'
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					deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
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					deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
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					deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
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					deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
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					deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
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					deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
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					deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
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					deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
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					deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
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					deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
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					EOF
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					;;
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					        *)
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					            echo "Please check whether there is aliyun|zju|tsinghua|163|ustc in the parameter"
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					            exit 1;;
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					    esac
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					fi
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