Could not get lock /var/lib/dpkg

今天使用apt命令，sudo apt-get install openssh-server，提示：

Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/

解决步骤
（1）ps afx|grep apt 查看被占用进程

（2）接着使用命令杀掉进程即可
sudo kill 进程id