1.当使用apt-get安装某服务时，提示E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)及E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?
--解决：删除掉被锁住的文件
sudo rm /var/lib/dpkg/lock-frontend