Because of the locked bootloader, Linux deployment on the Q20 generally happens in one of two ways:

The native Linux kernel port lacks deep power-saving sleep states (C-states). Battery life will decrease significantly faster compared to the native, hyper-optimized BlackBerry QNX OS. Conclusion: Is It Worth It?

However, limited Linux-like environments can be run or via emulation .

The bootloader is the first piece of software that runs when you power on your device; it initializes the hardware and tells your phone which operating system to load. To install a new OS, you generally need to unlock the bootloader to allow it to accept unofficial software.

If you want a concise, step-by-step chroot guide (assume developer mode enabled), I can provide that next.

Use pkg install proot-distro to install a chroot/proot isolated environment of Ubuntu or Debian.

You will immediately see the prompt change to something resembling localhost:~# . You are now running an authentic Linux environment inside the BlackBerry Q20 hardware layout. Working in the Q20 Linux Environment

To attempt this installation, you need a specific set of hardware and software tools. This process can permanently brick your device, so proceed at your own risk. Hardware Requirements A BlackBerry Classic (Q20) SQC100-X model. A high-quality Micro-USB cable capable of data transfer.

Your (running basic CLI tools or attempting a total OS replacement)

The Q20 runs on a dual-core Qualcomm Snapdragon S4 Plus (MSM8960) processor. While Linux kernels do exist for this processor family, BlackBerry used highly customized, proprietary hardware components for: The 3.5-inch square display (720x720 resolution). The physical QWERTY keyboard matrix. The optical trackpad.

Since you cannot replace the core OS, enthusiasts use three primary methods to get a Linux-like experience on the device: 1. Linux Chroot (Running Linux Inside BB10)

BB10 includes an (limited). If still present:

There are several reasons why you might want to install Linux on your BlackBerry Q20. For one, Linux is an open-source operating system that offers a high degree of customization and flexibility. By installing Linux, you can breathe new life into your Q20 and make it do things that it was never intended to do.