1.進入root模式sudo-s
2.進入ubuntu源的目錄cd/etc/apt
3.備份sources.listcp sources.listsources.list.bak
4.修改sources.list 刪除sources.list中的內容，把阿里雲的源複製進source.list中
gedit sources.list(刪除原有的內容)
複製下面阿里的源：
5.更新源 apt update
6.更新軟體 apt upgrade 至此，更換國內源完畢
Ubuntu18 04更換國內源
sudo cp etc apt sources.list etc apt sourses.list.backup 163源 deb bionic main restricted universe multiverse deb bionic security main restricted unive...
Ubuntu18 04更換國內源
mv etc apt sources.list etc apt sourses.list.backup 163源 deb bionic main restricted universe multiverse deb bionic security main restricted universe m...
Ubuntu18 04更換國內源
ctrl alt t開啟終端，執行下列命令 sudo gedit etc apt sources.list 將下面的源位址複製貼上到檔案中檔案儲存之後，執行下列命令 sudo apt get update sudo apt get upgrade阿里源 deb bionic main restric...