我正在Ubuntu18.04上升级osboxes.org虚拟机。需要注意的是，gpupgrade 可以进行滚动升级，即升级过程不需...
I have been using Linux for the past five years. My first operating system was CentOS. Later, I moved to OpenSUSE, and tried many distros such as Debian, Fedora, finally now I am using Ubuntu as my primary operating system. In the past, I was not aware of Oracle VirtualBox or KVM, ...