[FZH] #U Bug: 自动搜索安装打印机驱动时若驱动已存在，仍然要求安装，并返回错误

[Hexchain Tong]

https://bugzilla.redhat.com/show_bug.cgi?id=604730

https://twitter.com/Hexchain/status/16308053920

今天插上打印机才发现这个问题……这个 Bug 真是很秀逗

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