从@OneTrickPony的评论中，我了解到，

Mystique hasn\'t been updated for a long time, but a major update is going to be released these days, and most likely this won\'t happen in the new version...

因此，我卸载了；已删除mystique 主题（&A）；最后我安装了其他主题。我知道这不是确切的解决方案。但我别无选择。