Python Upgrade

• apt-get install linux-image-amd64 linux-headers-amd64
• ref. https://unix.stackexchange.com/questions/543601/failed-to-update-linux-headers-on-debian-stretch-debian-9

check version

jensd@deb:~$ cat /etc/debian_version
9.1
jensd@deb:~$ uname -r
4.9.0-3-amd64

Upgrade 3.7 to 3.9

Open the /etc/apt/sources.list file with the following command:

sudo nano /etc/apt/sources.list

Add the official testing repository. Append the following line of text to the end of the file:

deb http://http.us.debian.org/debian/ testing non-free contrib main

and

sudo apt update
sudo apt upgrade 
apt-get install python3-minimal