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/lock-frontend), is another process using it?

1. 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/lock-frontend), is another process using it?
   在apt-get  安装mysql的时候，服务器突然断开连接，因为网络不好，后来连上后，再次执行安装就会爆出这个错误。需要杀掉apt-get安装的进程，让其释放锁。 ps aux | grep -i apt  查看进程id，第二列的数字就是pid，然后kill  pid 即可。

2. 参考： https://itsfoss.com/could-not-get-lock-error/