debian 10 安装socat提示：package ‘socat’ has no installation candidate

新机器没装socat，手动安装提示报错错误

一、错误信息

package 'socat' has no installation candidate

二、解决

编辑/etc/apt/sources.list文件，加入下面行内容：

deb http://deb.debian.org/debian bullseye main contrib non-free

之后执行：

apt update

然后执行安装socat就不报错了：

apt install socat

参考：

• [Resolved] All no installation candidate