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每次我想更新/安装应用程序时总是会出现这样的错误。我该如何解决这个问题？

tag-icon • tag-icon 14.04
每次我想更新/安装应用程序时总是会出现这样的错误。我该如何解决这个问题？ 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
N: Ignoring file 'docker.list.save.2' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.3' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.4' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.5' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.2' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.3' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.4' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'docker.list.save.5' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension

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