docker in docker 出现 libltdl.so.7 问题

# docker ps -a
docker: error while loading shared libraries: libltdl.so.7: cannot open shared object file: No such file or directory

官方的jenkins镜像是基于Debian GNU/Linux 9，使用Dockerfile重新打image

FROM docker.io/jenkins
USER root
#清除了基础镜像设置的源，切换成阿里云源
RUN echo '' > /etc/apt/sources.list.d/jessie-backports.list 
  && echo "deb http://mirrors.aliyun.com/debian jessie main contrib non-free" > /etc/apt/sources.list 
  && echo "deb http://mirrors.aliyun.com/debian jessie-updates main contrib non-free" >> /etc/apt/sources.list 
  && echo "deb http://mirrors.aliyun.com/debian-security jessie/updates main contrib non-free" >> /etc/apt/sources.list
#更新源并安装缺少的包
RUN apt-get update && apt-get install -y libltdl7
ARG dockerGid=999

RUN echo "docker:x:${dockerGid}:jenkins" >> /etc/group