例如
$> deb http://ftp.debian.org/debian jessie-backports main
-bash: deb: command not found
打开 sources.list 在最后面添加一条源
$> nano /etc/apt/sources.list
添加
deb http://ftp.debian.org/debian jessie-backports main
最后更新下
$> sudo apt-get update
·源
https://ubuntuforums.org/showthread.php?t=889435
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