在安装更新时,即在运行命令行sudo apt-get update 或者运行更新管理器的时候,出现W: GPG 错误: W: GPG error: http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F4EA0AAE5267A6C 可…
(virtualbox/VMware)linux起步提示memoryforcrashkernel(0*0 to 0*0)notwithinpermissible http://www.myexception.cn/linux-unix/477672.html 一.在vmware上创建了虚拟机,操作系统是Red Hat Enterprise Linux Server release 5.3,当启动虚拟机时出现下面信息: Memory for crash kernel (0x0 to 0x0) n…