錯誤：sh: sendmail: not found
解決：sudo apt-get install sendmail
sendmail重新開機 停止 啟動：
/etd/init.d/sendmail restart
/etd/init.d/sendmail stop
/etd/init.d/sendmail start
錯誤：sh: sendmail: not found
解決：sudo apt-get install sendmail
sendmail重新開機 停止 啟動：
/etd/init.d/sendmail restart
/etd/init.d/sendmail stop
/etd/init.d/sendmail start
![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=)