Could not get lock /var/lib/dpkg/lock解决方法

在​​ubuntu​​​上安装ssh时执行（执行命令sudo apt-get install ssh时），
系统提示：
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
上面这坨指：无法获取/var/lib/dpkg/lock 锁，
解决方法：把当前的锁干掉，执行 sudo rm -rf /var/lib/dpkg/lock 。