warning: waiting for transaction lock on /var/lib/rpm/.rpm.lock

問題：執行安裝FTP時，報出python ** Found 1 pre-existing rpmdb problem(s), 'yum check' output follows: wget-1.12-5.el6_6.1.x86_64 is a duplicate with wget-1.12-1.8.el6.x86_64 的錯誤信息。緣由爲系統中存在兩個版本的wget，產生兩個wget版本的緣由

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