error when install tools in docker container

I install ubuntu-14.04.4-server-amd64.iso in my VirtualBox,then I use some way to get its rootfs. after that i can the rootfs to create my docker image.the Dockerfile as following:

FROM scratch
COPY rootfs /
RUN chmod u+s /usr/bin/sudo && chmod u+s /bin/mount && chmod u+s /bin/umount

I start my docker container,then I install some tools,like minicom,wget …,but error,the following is error msg:

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  • root@20ca319c51e6:~$ apt-get install minicom 
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    minicom is already the newest version.
    0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
    1 not fully installed or removed.
    After this operation, 0 B of additional disk space will be used.
    Do you want to continue? [Y/n] y
    Setting up libpam-systemd:amd64 (204-5ubuntu20.19) ...
    initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
    invoke-rc.d: unknown initscript, /etc/init.d/systemd-logind not found.
    runlevel:/var/run/utmp: No such file or directory
    dpkg: error processing package libpam-systemd:amd64 (--configure):
     subprocess installed post-installation script returned error exit status 100
    Errors were encountered while processing:
    E: Sub-process /usr/bin/dpkg returned an error code (1)

    I also try to “apt-get update;apt-get upgrade”,but get same error msg too,
    what’s should i do.need you help! thanks all 🙂

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