ubuntu18 軟體源替換成清華源 啊沒錯，這又是一個轉載 能用就好 ubuntu18替換軟體源 sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
![sudo apt-get update 出錯 Updating from such a repository can‘t be done securely, and is therefore[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)