Back up your Chromebook data
Check whether your Chromebook supports Linux
Enable Developer Mode if required
Open ChromeOS Settings
Go to Advanced
Open Developers
Turn on Linux development environment if available
Wait for the Linux container to install
Open the Linux Terminal
Update Linux packages
Install the Linux apps you need
If needed, create a bootable Linux USB drive
Reboot the Chromebook
Enter the boot menu if supported
Boot from the USB drive
Install Linux to the internal drive if desired
Follow the Linux installer prompts
Set up your user account
Reboot into Linux
Re-enable security settings if needed