I just tested the installation process for Python3.7, and adding the repository and calling the installation process does work to install Python3.7
I am referring to the update package located in /var/www/html/OS/BPA/updateBPA306.sh
The easiest way, when you are running an older OVA version:
sudo add-apt-repository -r ppa:jonathonf/python-3.6
sudo bash /var/www/html/OS/BPA/updateBPA306.sh
Afterwards it worked.
When you have a look at the file updateBPA306.sh you'll see, they removed the python-3.6 ppa and added a ppa for Python-3.7.
#sudo add-apt-repository ppa:jonathonf/python-3.6 -y
sudo add-apt-repository ppa:deadsnakes/ppa -y
Hope this helps.
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