Ubuntu images and Debian images are generally referred to as Linux images (they both use the Linux kernel), so when you see a Linux image or Linux system in the manual, it refers to a image or system like Ubuntu or Debian.<br><br>Many people will have doubts about whether they can use pure Ubuntu or pure Debian systems (pure here can be understood as systems downloaded from Ubuntu or Debian official websites). The answer is no, because Ubuntu and Debian do not provide an adapted system for the Orange Pi development board.<br><br>We can see from the official websites of Ubuntu and Debian that they both support the arm64 architecture (the SOC of the development board is the arm64 architecture), but please note that the support mentioned here refers only to the arm64 version of the software warehouse provided by Ubuntu or Debian (including Tens of thousands of software packages) or rootfs (these are the packages that Orange Pi uses when making Ubuntu or Debian systems). To make an Ubuntu or Debian system that can be used for a certain development board also needs to transplant U-boot and Linux kernel, etc., as well as repair the encountered bugs and optimize some functions, all of which are done by Orange Pi.<br><br>If Linux distributions such as CentOS, Kali, or OpenWRT are not ported by other developers or ported and adapted by themselves, they cannot be used on the development board of Orange Pi (hardware running these systems is no problem).<br><br>