打開終端

2.輸入以下命令備份原來的源。

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

3.再輸入以下命令打開sources.list配置文件更換源。

sudo vim/etc/apt/sources.list

配置內(nèi)容如下

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

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

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

deb 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 main restricted universe multiverse?

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

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

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

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

4.再輸入命令更新源。

sudo apt-get update

5.最后輸入命令更新一下軟件即可。

sudo apt-get upgrade