1. 備份原來的源： ``` sudo cp /etc/apt/sources.list /etc/apt/sources_init.list ``` **將以前的源備份一下，以防以后可以用的。** 2. 更換源 ``` sudo gedit /etc/apt/sources.list ``` **阿里源 （Ubuntu 18.04）** ``` deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse ``` 3. 更新 **更新源** ``` sudo apt-get update ``` **復損壞的軟件包，嘗試卸載出錯的包，重新安裝正確版本的。** ``` sudo apt-get -f install ``` **更新軟件** ``` sudo apt-get upgrade ```