我正在尝试使用Cent OS 6.8中的 root用户安装MySQL服务器rpm，但收到以下错误消息。
# rpm -iv MySQL-server-5.6.29-1.el6.x86_64.rpm
warning: MySQL-server-5.6.29-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
warning: waiting for transaction lock on /var/lib/rpm/.rpm.lock
^Cerror: can't create transaction lock on /var/lib/rpm/.rpm.lock (Interrupted system call)
你能帮忙吗？