It sounds like you're interested in installing Linux on a BlackBerry Q20 (Classic). I want to give you a realistic answer right away: it is not practically possible to install standard Linux (like Ubuntu, Debian, or even lightweight distros) on a BlackBerry Q20.
Standard BlackBerry 10 is locked down tight. To run Linux binaries, you need root access.
The BlackBerry Q20, also known as the BlackBerry Classic, is a smartphone that was released in 2014. While it was initially designed to run BlackBerry's proprietary operating system, many users have expressed interest in installing Linux on the device. In this article, we'll provide a comprehensive guide on how to install Linux on the BlackBerry Q20.
Because the BlackBerry 10 OS is built on QNX, a Unix-like real-time operating system, it is possible to run a Linux environment as a container or through terminal emulators.