"PHP模块gd:缺失“我收到了这样一个错误。我正在尝试安装php5-gd。我正在使用Ubuntu16.10和PHP版本7,我做了所有的更新。当我试图安装php5-gd时,出现了如下所示的错误。Package php5-gd is not available, but is referred to by another package.that the package
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