有时,Docker Hub上的自动构建会因PAM系统错误而失败,如下所示,这些错误来自两个独立的构建：

     Preparing to unpack 
    .../MysqL-server-5.5_5.5.38-0ubuntu0.14.04.1_amd64.deb ... 
    [91mchfn: PAM: System error 
    [0m 
    [91madduser: '/usr/bin/chfn -f MysqL Server MysqL' returned error code 
     1. Exiting.
    [0m
    [91mdpkg: error processing archive 
     /var/cache/apt/archives/MysqL-server-5.5_5.5.38-0ubuntu0.14.04.1_amd64.deb 
    (--unpack):
     subprocess new pre-installation script returned error exit status 1
    [0m

     Preparing to unpack 
    .../redis-server_2%3a2.8.4-2_amd64.deb ... 
    [91mchfn: PAM: System error 
    [0m 
    [91madduser: '/usr/bin/chfn -f redis server redis' returned error code 
     1. Exiting. 
    [0m 
    [91mdpkg: error processing archive 
    /var/cache/apt/archives/redis-server_2%3a2.8.4-2_amd64.deb (--unpack): 
     subprocess new pre-installation script returned error exit status 1 
    [0m

有趣的是,这种失败只是间歇性地发生并且使用相同的Dockerfiles.有没有办法解决？