ubuntu中，出現Failed to fetch http://…..時，需要換源

問題描述：出現Failed to fetch http://…..

 

問題原因：一般是由於直接使用國外的源無法連接的原因導致的

 

解決方案：直接替換成國內的源即可

                        （1）執行備份命令：sudo cp /etc/apt/sources.list /etc/apt/sources.list.old

                    （2）打開文件：sudo vim /etc/apt/sources.list

                    （3）換源：復制源覆蓋文件原來的內容（根據自己的網去嘗試，選擇最快的一個）

　　　　　   （4）更新源：sudo apt update        如果出現依賴問題-->sudo apt -f install

　　　　　   （5）更新軟件：sudo apt upgrade

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以下是ubuntu20.04版本軟件源 [另附其他版本地址：阿里雲開源鏡像站： http://mirrors.aliyun.com/]

                                                                               [清華大學：http://mirrors.tuna.tsinghua.edu.cn/  (IPv4+IPv6)]

                                                                               [中科大：http://mirrors.ustc.edu.cn/  (IPv4+IPv6)]

#添加阿里源

deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

 

deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

 

deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

 

deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

 

deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

 

deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

 

#添加清華源

 

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse

 

# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse

 

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse

 

# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse

 

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse

 

# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse

 

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse

 

# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse multiverse