As the title says, I have got 3.4.4 stable installed via Linux on my Chromebook and it is working well whilst I am learning, and want to update it to Godot 3.5.
How do I do this as 'sudo apt-get upgrade' did not do it.
Thanks in advance.
Godot may be in the system repository, but it is usually rather old. You just have to download it yourself. It is not installed. Just search "godot download" in your web browser and download it and run it.