I need an specific version of python in my host.
I know deadsnakes ppa but, but cosmic repository branch is not available.
Are there any alternative?
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I'd give Miniconda a try, been using it for months and it's awesome. You can install almost any version of Python on virtual envs, without messing with the system itself or the vanilla Python installed on your Ubuntu.
Just download the Miniconda3 sh script installer for Linux and execute it on a terminal, because it will ask some questions like where to install it and so on: https://docs.conda.io/en/latest/miniconda.html